Oxygen Absorber 750cc. Used with barrier or "mylar" bags for long term food storage. Can also be used for number of other application where long term storage is a must. Removes oxygen from any container by absorbing it. Slow acting, takes 3-4 days to absorb oxygen. Un-used packets can be re-sealed for later use. Must have item for food storage. The bag has 25 x 750cc packets.