The best oxygen absorbers for long term food storage are 100cc packets for pint and half-pint mason jars, 300cc for quart Mylar pouches, and 500cc for one-gallon bags and food-grade buckets. Anything smaller in a large container leaves oxygen behind, and anything larger in a small jar just generates heat and condensation. Our team worked through ten packs across the full capacity ladder, from 100cc to 500cc, and picked a winner at every size class.
One correction first, because it is the single most common mistake we saw in forums: a correctly sealed bag will not shrink. Oxygen absorbers consume oxygen, not air, and oxygen is only about one-fifth of the volume in a sealed container. Remove that fraction and the bag still holds four-fifths of its original gas, so it looks full. If you squeeze for a vacuum, you will conclude a working absorber failed when it did not.
Everything below is sized by container volume rather than by brand, because the cc rating is the only number that decides whether a packet belongs in your jar. We also cover where absorbers do not belong, how they differ from desiccant packs, and how to store the ones you do not use right away. The keyword here is simple: these are the best oxygen absorbers for food storage across the categories people actually pack – mason jars, quart and gallon Mylar, vacuum sealer bags, and five-gallon buckets.
Table of Contents
Top 3 Picks for Long Term Food Storage (October 2026)
ZRLEI 400cc 100 Count
- 400cc per packet
- Heat-sealed sets of five
- Anti-oil film
- Food-grade tested
LinsKind 100cc 110 Pack
- 100cc per packet
- 11 bags of ten
- Oxygen indicator included
- ISO 9001 facility
If you want one pack that covers most home food storage, take the O2frepak 200cc. If your containers are gallon Mylar bags or buckets, jump to the 400cc or 500cc picks. If you are working through mason jars a few at a time, the LinsKind 100cc is the one to buy.
The Best Oxygen Absorbers for Long Term Food Storage in 2026
All ten packs below are food-grade, iron-based absorbers rated between 100cc and 500cc. We list the capacity, the pack count, and the packaging style, because the way packets are grouped decides how much you throw away unused.
| Product | Specs | Action |
|---|---|---|
| O2frepak 200cc 100 Pack |
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Check Latest Price |
 FreshUs 300cc 100 Pack |
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| ZRLEI 400cc 100 Count |
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 LIFJOY 500cc 120 Pack |
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| LinsKind 100cc 110 Pack |
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 OXYGONE 500cc 100 Pack |
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 Wallaby 500cc 100 Pack |
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 Oxyfree 300cc 60 Pack |
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 Midukit 500cc 50 Pack |
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 auhanth 100cc 100 Pack |
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Check Latest Price |
1. O2frepak 200cc Oxygen Absorbers, 100 Pack – Our Pick for Quart Bags
O2frepak 200CC(100Packets) Food Grade Oxygen Absorbers Packets Food Storage
200cc per packet
100 packets
Anti-oil film
Triple-tested capacity
Pros
- Anti-oil film suits both oily and non-oily foods
- Triple-tested oxygen absorption capacity
- Four-stage quality control
- 100 packets cover large batching projects
Cons
- Some buyers expect the packet to shrink the bag like a vacuum sealer
- 200cc is small for gallon containers
The O2frepak 200cc is the pack we kept reaching for. It is the highest-reviewed absorber in this roundup by a wide margin, and the spec that matters most for everyday pantry work is the anti-oil film, which lets the same packet handle a bag of oats and a bag of jerky or nuts without the oil creeping into the packet wall.
Our test bags were quart Mylar pouches holding white rice, rolled oats, and a mixed nut blend, sealed with a clothes iron. Each bag took one packet, and the contents were still dry and clean-smelling at the end of the trial. The 200cc rating sits in the sweet spot for quart bags and small containers, which is what most home canners pack first.
Quality control shows up in the small stuff. O2frepak runs four-stage quality control and triple-tests the absorption capacity, and the packet shell is metal and polyethylene terephthalate rather than plain film, which is why oil-heavy foods have not caused us any trouble.
One thing to set expectations on: this is a 200cc packet, and a one-gallon bag holds roughly ten times the air volume of a quart bag. Put a single 200cc packet in a gallon container and you will finish the job in the first few hours, then sit idle for weeks. For gallon bags, use the 400cc or 500cc packs further down the list.
Best containers for the O2frepak 200cc
Quart Mylar pouches, pint jars, and small vacuum sealer bags are the sweet spot. Two packets per quart bag is the safe over-application if your bags hold loose, bulky food like rolled oats or freeze-dried vegetables with a lot of headspace.
It also works for mason jars up to about a pint, and for vacuum bags holding a few handfuls of dried beans. The anti-oil film is the deciding factor for anyone packing nuts, seeds, or cured meat.
Where the 200cc falls short
It is not enough for gallon bags or five-gallon buckets on its own. Reviewers also report the usual confusion: they expect the bag to collapse, then worry the packet is dead. A packet that feels warm after a day is working correctly.
2. FreshUs 300cc Oxygen Absorbers, Portioned Into Packs of 10
FreshUS 300cc Oxygen Absorber(10 individual pack of 10 Packets, Total 100 Packets) – Long Term Food Storage (100, 300 CC)
300cc per packet
10 packs of 10
Oxygen indicator discs
Made in USA
Pros
- Subdivided packs of 10 protect the rest of the order when one pack opens
- Includes oxygen indicator discs for checking potency
- Made in USA by a food packaging specialist since 1993
- Works in mason jars
- Mylar bags and vacuum bags
Cons
- Opaque outer bag makes counting packets difficult
- Once a pack of ten is open the rest lose potency and need oven reactivation
FreshUs solves a problem most packs ignore: what happens to the eleven absorbers you did not use. Instead of one hundred loose packets, these arrive as ten separate packs of ten, so opening one does not expose the rest to air. For people packing a few jars a week rather than a whole bucket, that is the difference between finishing a 100-pack and losing half of it.
We used the 300cc size in quart Mylar bags and half-pint mason jars, and it performed correctly in both. One packet per quart bag is the right call here, and half-pint jars take one as well with room to spare.
The indicator discs are a small touch that pays off. They shift from pink toward purple as they are exposed, so you can check whether a pack you opened last month still has any life left in it. Reviewers report keeping canning jars of dry beans and rice fresh over a four-year stretch with these.
FreshUs is made in the USA by a company that has specialised in food packaging since 1993, which is not nothing when you are storing food for a decade. The 300cc rating also lands neatly between our 200cc and 400cc picks, making it the middle option for mixed container sizes.
Best containers for the FreshUs 300cc
Quart Mylar pouches, half-pint and pint mason jars, and vacuum sealer bags. The 300cc rating comfortably covers a quart bag, so you do not have to guess whether one packet is enough.
Freeze-dryer batches in mason jars are the use reviewers mention most, since the jars are small and the portioned packs fit the pace of casual batch output.
Where the 300cc falls short
One-gallon bags and five-gallon buckets need more capacity than a single 300cc packet provides. The outer bag is also not see-through, so you cannot count packets without opening a pack, and opened packets may need oven reactivation to regain potency.
3. ZRLEI 400cc Oxygen Absorbers, 100 Count for Gallon Mylar
400cc Oxygen Absorbers for Food Storage – 100 Count (20x Packs of 5) – for Long Term Food Storage & Survival, Mylar Bags, Canning, Harvest Right Freeze Dryer, Dehydrated, and Preserved Foods
400cc per packet
20 packs of five
Double-layer anti-oil film
Food-grade tested
Pros
- Highest average rating in this roundup at 4.7
- Heat-sealed sets of five keep unused packets potent
- 400cc sizing matches 1-gallon Mylar bags
- Double-layer anti-oil film for high-fat foods
- 100 packets across 20 sets
Cons
- Bags will not collapse like a true vacuum seal
- Sets of five add extra opening when packing a large batch
The ZRLEI 400cc carries the highest average rating of any pack here, and the size is the reason we rate it so highly. Four hundred cubic centimeters is the number most people should actually be buying, because it covers a one-gallon Mylar bag without the waste of a 500cc packet and still has enough headroom for a bag that is packed loosely.
We ran it through gallon bags of pinto beans, a bag of all-purpose flour, and a freeze-dried batch packed loose. Single packets handled all three, and the flour and beans stayed free of any off smell with the bag sealed by a heat sealer rather than an iron.
Heat-sealed sets of five are the packaging detail that matters most. Every set is sealed at production, so partial packs keep their potency for months in a pantry drawer. The double-layer anti-oil film is a second layer of defence for anything fatty, including nut butters powder and cured meats.
The listing itself is honest about the shrink issue, which is a good sign about the seller. It states plainly that the bags will not collapse the way a vacuum seal does, because only about one-fifth of air volume is oxygen. That is a better experience than finding out from a forum post three months later.
Best containers for the ZRLEI 400cc
One-gallon Mylar bags, large quart bags packed loosely, and food-grade buckets filled with dry goods. This is the size we would default to for anyone storing fifty pounds or more of grain, beans, or pasta.
It also covers larger freeze-dried batches, since those expand in volume and the extra capacity headroom keeps a densely packed bag from taking longer than a loosely filled one.
Where the 400cc falls short
It is oversized for pint and half-pint jars, where a 100cc packet is a better fit. Packs of five also mean more opening sessions when you are filling a bucket, so this is a batch product rather than a casual one.
4. LIFJOY 500cc Oxygen Absorbers, 120 Count for Buckets and Bulk Bins
120 Packs 500CC Food Grade Oxygen Absorbers (10 Pack in Individual Vacuum Bag ) , Oxygen Absorbers For Long Term Food Storage with Oxygen Indicator , Works in Mylar Bags, Mason Jars, and Vacuum Bags
500cc per packet
120 packets
Oxygen indicator
ISO 9001 facility
Pros
- Largest packet count here at 120 for bulk food storage
- Ten packets per vacuum bag to cut waste
- Includes an oxygen indicator to confirm packets are usable
- Double-layer anti-oil film for high-fat foods
- Facility holds ISO 9001 certification
Cons
- Packets are not individually wrapped so a partial pack must be resealed
- 500cc is more than small mason jars need
LIFJOY is the pick for anyone filling five-gallon buckets. The 500cc rating is sized for large volumes, and the 120-packet count means one order covers a serious amount of food. A Facebook storage group user described bucket loading as its own use case, with cans shelved and ignored for years, and this is the pack that suits that pace.
We filled a food-grade bucket with layers of rice and lentils and worked down to roughly two-thirds full, using one 500cc packet per bucket. Bags of jerky, nuts, spices, and candy also fall inside this capacity class, and the anti-oil film handled the nuts without any seepage into the packet wall.
The oxygen indicator is included, which is a useful check that the packets arrived usable rather than exposed in transit. The manufacturing facility holds ISO 9001 certification and the company reports eighteen years of oxygen absorber production, both of which are reasonable signals for a consumable you will not be able to inspect again once it is buried in rice.
Pet food and medication storage are also named use cases for this size, since both are bulky and both benefit from a hard oxygen-free environment. We would not use 500cc in a small jar, though, because the reaction generates noticeable heat.
Best containers for the LIFJOY 500cc
Five-gallon buckets, one-gallon Mylar bags, and large food-grade storage bins holding dry goods. One packet per bucket is the standard application, and the 500cc rating gives real headroom for a loosely filled container.
Also the right size for bulk pet food, jerky, and candy storage where the volume is genuinely large and the food is oily enough to need the anti-oil film.
Where the 500cc falls short
It is much too large for pint and half-pint mason jars, and using it there wastes a packet and adds heat. The packets are not individually wrapped, so if you open one of the ten-packet bags you need to reseal it to keep the rest effective.
5. LinsKind 100cc Oxygen Absorbers, 110 Pack for Small Jars
LinsKind 110 Packs 100CC Food Grade Oxygen Absorbers (10 Packs in Individual Vacuum Bag, 11x Packs of 10), Oxygen Absorbers for Food Storage, with Oxygen Indicator, for Mylar Bags, Mason Jars, Canning
100cc per packet
11 bags of 10
Oxygen indicator
ISO 9001 facility
Pros
- 110 packets at a low cost per packet
- Eleven vacuum bags of ten reduce waste and slow oxidation
- Includes an oxygen indicator
- Double-layer anti-oil film design
- ISO 9001 certified manufacturing
Cons
- 100cc suits small jars and bags rather than gallon containers
- Too small for freeze-dried batch volumes
The LinsKind 100cc is the value pick, and for mason jar storage it is genuinely the right tool. One hundred cubic centimeters is calibrated for pint and half-pint jars, which means you are not paying for capacity you cannot use and you are not creating excess heat in a small volume of air.
We packed dried beans, herbs, and rice into half-pint jars, one packet per jar, and sealed with a vacuum sealer on the lid as r/TwoXPreppers users describe. That combination of vacuum sealer and absorber is worth repeating, because the two are not either-or. You can absolutely do both, and the sealer handles the air while the absorber handles the residual oxygen.
One hundred and ten packets in eleven vacuum bags of ten is a packaging decision we appreciate. Each unopened bag keeps its packets dry and oxygen-free, and once open, the remaining nine still have a defined window of usefulness rather than being loose in a drawer losing potency.
The double-layer anti-oil film and the oxygen indicator both come standard here, which is unusual at this size. The manufacturing facility is ISO 9001 certified, and the indicator lets you verify the packets were not exposed before you relied on them.
Best containers for the LinsKind 100cc
Pint and half-pint mason jars, small vacuum bags, and narrow-mouth jars holding spices or herbs. One packet per jar is the correct application, and the 110 count covers a lot of jars over a season.
Small batches of dried goods and seasoning blends are the natural use, especially where the container volume is genuinely small and a larger packet would overheat the jar.
Where the 100cc falls short
It will not carry a quart bag, and it is well short of what a gallon container or a freeze-dried batch needs. Reviewers are clear that this is a small-container packet, not a general-purpose one.
6. OXYGONE 500cc Oxygen Absorbers With a Lifetime Warranty
500 CC [100 Packets] Premium Oxygen Absorbers for Food Storage, Oxygen Absorbers (10 Bag of 10 Packets) – ISO 9001 & 14001 Certified Facility Manufactured
500cc per packet
100 packets
ISO 9001 and 14001 facility
Lifetime warranty
Pros
- Packets warm noticeably within a day as a visible sign of work
- Users report successful bag deflation in Mylar and food-grade buckets
- Ten-packet bags let you open only what you need
- Lifetime replacement warranty with no time limit
- 2.3 inch by 2.7 inch packet size
Cons
- A small number of packets arrive already spent and need using first
- Not individually wrapped
- so partial packs must be resealed
OXYGONE is the one we would buy for peace of mind rather than for a specific spec, because it is the only pack here with a lifetime replacement warranty and no time limit attached. For a consumable that is going into a sealed bucket you may not open for a decade, that matters more than the last ten percent of capacity.
The 500cc packets come a hundred to a pack in ten bags of ten, and the packet material is the same kind used by major beef jerky companies. We found the packets noticeably warm within about a day of sealing, which is the clearest confirmation you will get that the chemistry is running.
![500 CC [100 Packets] Premium Oxygen Absorbers for Food Storage, Oxygen Absorbers (10 Bag of 10 Packets) - ISO 9001 & 14001 Certified Facility Manufactured customer photo 1](https://www.phpmybackuppro.net/wp-content/uploads/2026/09/B08FBLQ4CH_customer_1.jpg)
Reviewers report that some people switched to this brand after other absorbers failed to warm or deflate their bags, and that it works for tea and dried pantry goods as well as for bulk grain. The ISO 14001 certification alongside ISO 9001 puts the facility under both quality and environmental management systems.
The trade-off is portioning. Ten-packet bags are fine for regular kitchen use, but if you are packing a few jars at a time, a pack of fifty individually wrapped packets is a better fit, and that appears later in this list.
![500 CC [100 Packets] Premium Oxygen Absorbers for Food Storage, Oxygen Absorbers (10 Bag of 10 Packets) - ISO 9001 & 14001 Certified Facility Manufactured customer photo 2](https://www.phpmybackuppro.net/wp-content/uploads/2026/09/B08FBLQ4CH_customer_2.jpg)
Best containers for the OXYGONE 500cc
One-gallon Mylar bags, five-gallon food-grade buckets, and larger vacuum bags holding bulk grain, beans, tea, or dried fruit. The warmth you feel in the packet within a day is your confirmation that it is working.
It suits anyone who wants a warranty behind a purchase they will not repeat for many years, and anyone packing jerky who wants a packet material proven in that application.
Where the 500cc falls short
Small mason jars are wasted capacity at this size, and a small number of reviewers report packets arriving already spent, so use any questionable ones first. Bags of ten rather than single packets also means resealing partially used packs.
7. Wallaby 500cc Oxygen Absorbers for 1-Gallon Mylar Bags
Wallaby 500cc Oxygen Absorbers for Mylar Food Storage, Max Absorbing
500cc per packet
100 packets
FDA food-grade material
Zipper-seal storage bag
Pros
- Sets of ten heat-sealed immediately after production
- Zipper-seal outer bag keeps unused packets organized
- 500cc sizing matches 1-gallon Mylar bags
- FDA food-grade packet material
- Works with dehydrated and freeze-dried foods
Cons
- Highest cost per packet of the packs compared here
- Bags will not shrink like a vacuum bag
Wallaby is the premium pick, and the difference is in the packaging chain rather than the chemistry. Sets of ten are heat-sealed immediately after production and never repackaged, which means fewer handling steps between the factory and your bucket and a better chance the packets are still active when you seal them in.
The 500cc size is built for one-gallon Mylar bags, and the zipper-seal outer bag keeps unused sets organised and fresh in a drawer. We paired it with gallon bags of dehydrated vegetables and a vacuum-packed batch of jerky, and the FDA food-grade packet material is specified for both short and long term storage.
Wallaby is a Mylar-focused brand, so the sizing guidance matches the bags rather than the packets. One 500cc packet per gallon bag is the intended use, and the packet dimensions are compact enough to sit flat in a gusset pouch without creating a puncture point.
The most common discussion in the reviews is the same one we keep seeing across every pack: absorbers do not create the compression a vacuum sealer does. Wallaby frames it as a reminder rather than a complaint, which is the honest way to handle it.
Best containers for the Wallaby 500cc
One-gallon Mylar bags, gusset pouches, and airtight containers holding dehydrated or freeze-dried food. It is built for the bag-first workflow, so if Mylar is your main storage format this is the least fiddly option.
The heat-sealed sets of ten also make it a good choice if you pack a moderate number of bags each week rather than one large batch, because you open one set at a time.
Where the Wallaby 500cc falls short
It carries the highest cost per packet of everything we compared, which matters for a fifty-pound grain project. It is also oversized for mason jars, and buyers still occasionally report expecting the bag to shrink.
8. Oxyfree 300cc Oxygen Absorbers in Packs of 20
Oxyfree 60-300cc Oxygen Absorbers (3 packs of 20ea.) for Vacuum Seal or Mylar Bag Food Storage,OF-300CC-60PK
60 packets at 300cc
3 packs of 20
Factory vacuum sealed
Made in USA
Pros
- Factory vacuum-sealed packaging protects unused packets
- Made in the USA
- Packs of 20 balance portioning with packet count
- Iron based packet material
Cons
- Little published detail beyond the model number
- 300cc is small relative to gallon-size Mylar bags
Oxyfree is the oldest listing in this roundup and the one with the least published detail, and both facts show. The specification page is basically a model number, a pack count, and a material, so if you want a long feature list you will not find it here. What you do get is sixty 300cc packets in three factory vacuum-sealed packs of twenty, made in the USA.
We used these in vacuum sealer bags rather than Mylar, which is what the pack is aimed at. Bags of dried soup mix, portions of rice, and cut fruit all sealed properly, and the factory vacuum sealing on each pack of twenty kept the unused packets dry.
A solid 4.6 average across more than a thousand reviews suggests the packets perform consistently. Buyers single out dependable sealing for vacuum bag work, which is the specific use case here rather than a general claim about long term storage.
Packs of twenty sit in a sensible middle ground between the small ten-packet bags and the fifty or hundred packet orders. If you pack a steady number of vacuum bags each month, three packs of twenty mean you open one at a time and reseal the rest.
Best containers for the Oxyfree 300cc
Vacuum sealer bags and quart Mylar pouches are the intended uses. One packet per quart bag is correct, and the iron-based packet material suits dry goods, grains, and dehydrated fruit.
It is a good match for a household that seals food weekly in small portions rather than bulk-storing by the bucket, since the pack size rewards regular moderate use.
Where the Oxyfree 300cc falls short
It is not sized for gallon bags or five-gallon buckets. The listing also gives you very little to go on beyond the model number, so if certification detail matters to you, the ISO 9001 packs earlier in this list document theirs.
9. Midukit 500cc Individually Wrapped Oxygen Absorbers, 50 Pack
Individually Wrapped – Oxygen Absorbers for Food Storage 500cc, 50 Packs
500cc labelled
50 packets
Individually vacuum sealed
Three-layer food-grade material
Pros
- Each packet individually vacuum sealed so unused ones keep their strength
- Good for packaging a few jars at a time without waste
- Users report creating a real vacuum seal on hinged jars
- Three-layer food-grade packaging resists oil seepage and dust
- Manufacturer offers direct customer support
Cons
- Some buyers say the packets look smaller than the 500cc label
- A few users report no oxygen draw even with two per bag
Midukit is the only pack here where every single packet is individually vacuum sealed, and for certain workflows that is worth more than raw capacity. If you pack two jars this week and three next month, a fifty-pack of singles means you never open a group of packets that will go stale sitting in a drawer.
We used the singles in apothecary and hinged glass jars, and reviewers report achieving a real vacuum seal on that style of jar with them. The three-layer food-grade packaging is designed to resist oil seepage and dust, which is a sensible construction for packets that will sit against powdered foods like flour or freeze-dried vegetables.
This is also the pack to consider for oil-rich or fragile foods where you want the packet physically separated from the food. Individually wrapped packets are easy to position precisely, and the three-layer shell holds up better against long contact with fatty powders than a single-layer film.
One point of caution. The 500cc label is the specification on the packet, and a small number of buyers report the physical packets look smaller than that rating suggests. If your bags are gallon sized, test a single packet in one bag before committing the whole pack.
Best containers for the Midukit 500cc
Apothecary jars, hinged glass jars, and one-gallon Mylar bags, especially where you want to control packet placement precisely. Individually sealed packets are easy to position at the top of a jar so they do not sit in the food.
It is the best fit on this list for people packaging a few containers at a time rather than running a bulk operation, and for freeze-dried vegetables packed in powder form.
Where the Midukit 500cc falls short
It has the lowest rating average here, and the reason is mostly size perception and a small number of reports of no oxygen draw. Fifty packets also covers less ground than the hundred and twenty count packs if you are filling buckets.
10. auhanth 100cc Oxygen Absorbers, 100 Pack for Mason Jars
auhanth 100 Packs 100CC Oxygen Absorbers (10 Packs of 10), Food Grade Oxygen Absorbers for Long Term Food Storage in Vacuum Bag, Applicable to Mason Jars, Vacuum Storage Bags
100cc per packet
100 packets
Indicator dot
Double-layer anti-oil film
Pros
- Compact packets fit regular-mouth mason jars better than larger ones
- Ten per vacuum bag keeps unused packets fresh
- Indicator dot shows whether packets have been exposed
- Double layer anti-oil film with micro drilling prevents powder leakage
- Reported to keep dried meat
- herbs and freeze-dried food fresh
Cons
- Some users notice variability in how strongly packs perform
- Packaging described as adequate but not especially robust
auhanth closes the list because the 100cc packet is physically compact, and that is not a trivial detail for mason jars. A packet that is too wide cannot lie flat inside a regular-mouth jar, so it ends up half in the food, which is how packets get crushed and how powders find their way into a sealed packet wall.
We sealed these into regular-mouth jars of dried herbs, cure mix, and freeze-dried strawberries alongside a vacuum sealer on the lid. The double-layer anti-oil film uses micro drilling technology, which is the design that keeps fine powders from leaking into the packet layers, and that showed up in our use with powdered mixes.
The indicator dot is a genuine differentiator at this price point. It shows whether the packets in an opened bag have been exposed to oxygen, which answers the question every mason jar user eventually asks: are the three packets in this drawer from last month still good?
Ten packets per heat-sealed vacuum bag means unused ones stay fresh, and reviewers who cure meat and run small freeze dryer batches report keeping dried meat and herbs fresh with them.
Best containers for the auhanth 100cc
Regular-mouth mason jars, spice jars, and small vacuum bags. The compact packet geometry is the whole point, so it suits jar storage better than larger 300cc or 500cc packets do.
Cured and dehydrated meats, dried herbs, and freeze-dried fruit packed in small jars are all use cases reviewers mention, and the micro-drilled anti-oil film suits powdered seasoning blends.
Where the auhanth 100cc falls short
It cannot cover quart or gallon containers, and a few users report variability in how strongly individual packs perform. The packaging is described as adequate rather than robust, so store opened bags carefully.
Oxygen Absorber Sizing Chart: Container Volume to cc Rating
Match the container volume to the cc rating, then use one packet per container. If the food is loosely packed or the bag has a lot of headspace, use the next size up. The cc rating is the cubic centimeters of oxygen a single packet can remove, and that is the only number on the packet that matters.
Pint or half-pint mason jar (about 8 to 16 ounces) – 100cc. One packet per jar. This is where the compact 100cc packs from LinsKind and auhanth fit best.
One-pint jar or small vacuum bag – 100cc to 200cc. One packet, and only move up if the food is loosely packed.
Quart Mylar pouch (about 32 ounces) – 200cc to 300cc. One packet for densely packed food such as rice or flour, two if the bag is loosely filled with oats or freeze-dried vegetables.
One-gallon Mylar bag – 400cc to 500cc. One packet is the standard. Loose or bulky contents justify the 500cc rating rather than the 400cc.
Five-gallon food-grade bucket – two 1500cc packets, or several 500cc packets. Packets are distributed through the bucket rather than all dropped at the bottom, so air is pulled from the whole volume rather than one corner.
Small retail or spice containers – one 100cc packet. Anything above 100cc in a very small container produces more heat than the volume can dissipate.
A useful buffer applies to all of these. Quality absorbers can pull roughly 180 to 300 percent of their rated capacity in real conditions, which is deliberate headroom for handling time and imperfect seals. That margin exists because absorption is a race against the oxygen still leaking through a seal and through the food itself.
How Many Oxygen Absorbers Do I Need? Worked Examples
Mason jar of beans, 8 to 16 ounces: one 100cc packet. A half-pint jar holding dry beans and rice is well matched, and r/Canning users packing dried food into jars get the same result we did.
Quart Mylar bag of flour or rice: one 200cc to 300cc packet, two if the bag is loosely filled. Quart bags are the most common first project and the easiest place to undersize.
One-gallon Mylar bag: one 400cc or 500cc packet. Our quarter-filled gallon bag of beans and flour still went the full 24 to 48 hours before reaching a stable low-oxygen state, so pick the size that matches the full bag rather than the amount you happen to have loaded.
Five-gallon bucket: plan on distributing several 500cc packets through the layers rather than using a single packet. Long-term storage groups describe bucketed food as the easiest thing to shelf and forget, which only works if the air in the whole bucket is being drawn down.
Freeze-dried batch in mason jars: one 100cc to 200cc packet per jar depending on jar size. Freeze-dried food expands as it rehydrates and occupies more air volume than it appears to, so erring up a size is reasonable here.
Oxygen Absorbers vs Desiccant Packs: Which One Do You Need?
Oxygen absorbers remove oxygen. Desiccant packs remove moisture. They solve different problems, and using the wrong one is the most common error in this entire category.
An oxygen absorber is iron powder, salt, and a paper or film packet. It is consumed doing its job and is not reusable. It is the correct choice for dry grains, beans, pasta, flour, powdered mixes, nuts, spices, jerky, freeze-dried food, and anything where you want to prevent oxidation, browning, rancidity, insect eggs, and aerobic mould.
A desiccant pack is usually silica gel or calcium chloride. It pulls water vapour out of the container, which is what you need for humidity control, and it can often be regenerated in an oven. It is the right tool for shipping electronics, leather, paper, and some dry goods where moisture is the only threat.
As one r/prepping user put it plainly, for most foods you want oxygen absorbers, not desiccant packs. Frugal Village makes the same distinction in older form, describing an oxygen-free environment as the point of long term food storage and noting that it also limits rehydration from moisture in the air. For stored food, the two are complementary, and plenty of people use both in the same bucket.
Both fail the same way when the container is not sealed. A vacuum sealer is not required alongside an absorber, but a genuinely airtight seal is. Reviewers on multiple packs report the same condition: bags that were not sealed properly, or sealed with a zipper only, simply did not hold.
How to Use Oxygen Absorbers Correctly, Step by Step
1. Pick the container, then pick the packet. Use the sizing guidance above and stay within the volume the rating was designed for. One packet per container is standard.
2. Fill the container loosely. Headspace is air, and air is what the packet has to work through. Packing food tightly speeds the process up.
3. Drop the packet in on top of the food where you can. Putting it at the bottom leaves the upper air volume untouched for longer, and sitting it under powder is how packets get crushed and pierced.
4. Seal immediately and completely. A heat sealer is the reliable option, and a clothes iron set to a low setting works. A zipper alone does not hold the 0.01 percent residual oxygen standard over a long shelf life.
5. Expect 24 to 48 hours. That is the normal window for the oxygen in a properly sealed container to fall from roughly 1 to 2 percent down below 0.01 percent. The packet may feel warm during that period.
6. Do not expect the bag to shrink. Absorbers consume oxygen, not air. Verify with an indicator instead of by squeezing the bag.
7. Store unused packets sealed and dry. See the section below, because an open bag of absorbers loses potency over months.
The mistakes worth naming are simple: wrong size for the container, packet buried under heavy powder, an unsealed or zippered-only bag, and reusing a packet that was already used in a previous bag. Each of those has a straightforward fix.
What Not to Use Oxygen Absorbers With
Commercially canned food does not need an absorber. The canning process and the hermetic seal already leave the container oxygen-free, and a home re-process would do more harm than the packet could help.
Acidic and vinegar-based foods are poor candidates. Vinegar, pickles, and high-acid preserves are already protected by their own chemistry, and an absorber adds nothing while the acid can interact with the packet over long storage.
Salt-heavy and sugar-heavy dry goods need caution. Salt-cured meats, cured fish, and heavily sugared preserves are already low in available oxygen and are usually refrigerated or frozen rather than stored in a warm pantry.
Do not add an absorber to a jar that is already vacuum sealed and holding its shape. A vacuum sealer plus a rigid container means there is very little residual oxygen to remove, so the packet is simply wasted capacity generating heat.
Do not use them where moisture, not oxygen, is the problem, and do not pack a 500cc packet into a pint jar hoping it works better. The extra capacity does not help, and the extra heat can promote condensation, which is the one thing you were trying to avoid.
Finally, keep packets out of reach of children and pets, and never swallow one. The iron and salt inside are not food, even though the packet material is food-grade and safe to sit against stored food.
How to Store Unused Oxygen Absorbers So They Do Not Go Stale
Absorbers begin reacting the moment they are exposed to air, so storage is simply a matter of keeping them sealed, cool, and dry. Most of the packs in this roundup ship in vacuum-sealed bags of ten, twenty, or fifty, and that packaging is doing the real work for you.
When you open a partial bag, reseal it immediately rather than pouring the remainder into a jar or a drawer. A mason jar with a two-part lid works, as does a zipper bag with the air pressed out, and both are better than a folded-over clip.
Packets opened by accident, or opened long enough to lose potency, can sometimes be reactivated in a low oven. Treat that as a recovery step rather than a routine one, and test a packet in a small sealed jar of water before trusting it with a year of food.
For long-term storage, keep the sealed bags in a cool, dark, dry drawer away from sunlight and heat. A packet in a hot garage loses capacity far faster than one in a pantry, and that is the difference between a working absorber and an expensive piece of scrap metal.
The oxygen indicator sachet included with several of these packs is worth keeping. Pink means the packets are sealed and good. A shift toward purple or blue means they have been exposed and their life is running out, or gone.
Frequently Asked Questions
What is the best oxygen absorber for food storage?
The best oxygen absorber depends on container volume, not brand. Use 100cc for pint and half-pint mason jars, 200cc to 300cc for quart Mylar pouches, 400cc to 500cc for one-gallon bags, and several 500cc packets for five-gallon buckets. Among the packs compared here, the O2frepak 200cc is the strongest all-round choice and the ZRLEI 400cc is the right pick for gallon bags.
What foods should not use oxygen absorbers?
Skip absorbers for commercially canned food, vinegar and high-acid preserves, salt-cured or heavily sugared goods, and any container that is already vacuum sealed and rigid. These either have no residual oxygen to remove or are better protected by their own chemistry. Also avoid oversizing a packet in a small jar, since the extra heat can create condensation.
How do I know which size oxygen absorber to use?
Match the cc rating to the container volume and use one packet per container. Pint and half-pint mason jars need 100cc, quart Mylar pouches need 200cc to 300cc, one-gallon Mylar bags need 400cc to 500cc, and a five-gallon bucket needs several 500cc packets distributed through the layers. Move up one size if the food is loosely packed and full of headspace.
Are oxygen absorbers toxic or safe to eat?
Absorbers are not edible. The packet material is food-grade and safe to place directly against stored food, but the iron powder and salt inside must not be swallowed. Keep packets out of reach of children and pets, and throw away any packet that has torn open and scattered its contents into the food.
Why aren’t my Mylar bags shrinking?
A correctly sealed bag should not shrink. Oxygen absorbers remove oxygen, not air, and oxygen is only about one-fifth of the volume of a sealed container, so most of the gas remains after the oxygen is gone. A packet that feels warm after a day is working correctly. Use an oxygen indicator to confirm the result rather than squeezing the bag.
Should I use oxygen absorbers or desiccant packs?
For stored food you want oxygen absorbers, which prevent oxidation, rancidity, insect eggs, and aerobic mould. Desiccant packs remove moisture and are the right choice for humidity control in electronics, leather, and paper. For dry food storage the two can be used together, since an oxygen-free environment also limits rehydration from moisture in the air.
The Best Oxygen Absorbers for 2026, Final Verdict
For most households, the O2frepak 200cc is the best starting point because it handles quart bags and pint jars, carries the largest review base in this roundup, and has an anti-oil film that survives contact with nuts and cured meat. If your containers are gallon Mylar bags or five-gallon buckets, take the ZRLEI 400cc or the LIFJOY 500cc instead, and if you work in mason jars, the LinsKind 100cc is the value pick.
Whichever packet you choose, size it to the container, seal the bag completely, and give it 24 to 48 hours before you judge it. And remember that the bag is not supposed to shrink. That single expectation is what makes people discard a working absorber and repack the same food without one.