Are you storing your own food? Use these 300cc oxygen absorbers when storing smaller amounts of food or in combination with other strengths of oxygen absorbers to meet more complex storage needs. If you are new to do-it-yourself food storage, Oxygen Abosrbers are the little packets that absorb excess oxygen in your storage bags and containers. They are most often used to preserve food for long term storage, but have many other uses as well. Safe, non-toxic, ease to use and extremely effective. See below for more information on how to use them.