If you're storing dry food for long periods of time then you need these Oxygen Absorbing Packets from Oxy-Sorb. These absorbers are packets filled with iron powder that oxidize and absorb oxygen when exposed to it. Doing this extends the shelf life of dry foods and grains. When used with proper packaging and sealing, including vacuum sealing, the oxygen in the packaging is greatly reduced and you get maximum efficiency. Our absorbers bring the oxygen level down reliably to .01% or less. Whether you're looking to stock up on grains or other dry foods, or to prep them for long term storage, you need these packets. Order now and get the storage that's more effective than freezing and vacuum sealing! Includes 25 packets. Safe to contact food. One 500cc Oxygen absorber should effectively cover up to 2 gallon of space.