Oxygen Absorber Size Chart: How Many CC for Every Container
Using too few oxygen absorbers in a sealed container doesn’t just shorten shelf life a little — it can let enough residual oxygen remain that insect eggs survive and food oxidizes faster than you planned, defeating much of the point of long-term storage in the first place. The fix is simpler than it sounds once you know the right CC-per-volume numbers.
Oxygen Absorbers Are Only Safe for Low-Moisture Dry Goods
This matters more than the CC math: oxygen absorbers are intended for dry goods at roughly 10% moisture content or below — rice, beans, wheat, pasta, freeze-dried foods that are genuinely fully dried. Using one on anything with higher moisture content (jerky that isn’t fully dried, imperfectly dehydrated fruit, or any home-dried food that’s still slightly pliable) can create a low-oxygen, moist environment that favors the growth of Clostridium botulinum, the organism responsible for botulism — a genuine, serious risk, not a theoretical one. Confirm a food is both appropriate for oxygen-absorber storage and fully dried to a safe moisture level before sealing it with one; when in doubt about a specific food, don’t use an oxygen absorber on it.
Why CC Count Matters More Than People Think
Oxygen absorbers are rated in cubic centimeters (CC) of oxygen they can absorb, and the right count depends on your container’s size and how tightly the food inside is packed — a loosely packed container has more air space to absorb than a densely packed one of the same size, even though they look the same from outside.
Oxygen Absorber Size Chart by Container
| Container | Typical CC needed (densely packed dry goods) |
|---|---|
| Quart-size Mylar bag | 100-300 CC |
| 1-gallon Mylar bag | 300-500 CC |
| 5-gallon bucket with Mylar liner | 2,000 CC (often as two 1,000 CC packets) |
| #10 can | 300-500 CC |
| Quart canning jar (dry goods) | 100 CC |
See our #10 cans vs. Mylar bags guide and our Mylar bags and oxygen absorbers guide for the full setup process these numbers plug into.
Why More Is (Usually) Better Than Less
Using a slightly oversized absorber for your container does no harm — the excess capacity just goes unused. Using an undersized one is the actual risk, since it may fully absorb before the air inside is depleted, leaving residual oxygen in the package. When in doubt, round up to the next standard CC size rather than down. Buying 300cc oxygen absorbers in bulk keeps the size right for most Mylar bag and jar setups without tracking multiple pack sizes.
Food Density Changes the Math
These numbers assume dense, dry goods like rice, beans, or wheat. Bulkier or less densely packed items — pasta shapes, freeze-dried foods, or anything with more air pockets between pieces — have more trapped air volume per container and may need a larger absorber than the chart suggests for the same container size. See our long-term rice storage guide for a worked example using one of the most common dense staples.
Signs You Used the Wrong Size
A properly sized and sealed Mylar bag should pull tight and feel vacuum-sealed within about 24 hours as the absorber works. If a bag stays loose and un-collapsed well beyond that window, the absorber was likely undersized, expired, or exposed to air too long before sealing — any of which means re-checking that batch rather than assuming it’s fine.
Storage and Shelf Life of the Absorbers Themselves
Oxygen absorber packets start absorbing the moment they’re exposed to air, including while you’re setting up multiple containers in one session — work quickly once a packet is opened, and reseal any unused absorbers from a multi-pack immediately in a resealable Mylar storage pouch to preserve their remaining capacity for your next batch.
Bottom Line
Match your oxygen absorber CC count to your container size and how densely it’s packed, round up rather than down when unsure, and watch for a properly vacuum-sealed Mylar bag within 24 hours as your confirmation the size was right.
Official sources: National Center for Home Food Preservation, USDA Food Safety and Inspection Service.
