NOTE - Bags may NOT shrink like a vacuum bag when the oxygen has been removed. Absorbers do NOT absorb air; they absorb oxygen which is only 20% of the air. About 1/5 of the air volume will be gone, 4/5 remains no matter how many absorbers are used. food grade oxygen absorbers o2 absorbers food gradeFOOD GRADE & SAFE - Our Oxygen Absorbers packaging is made of food-grade material and passed strict food testing, so it can be safely stored with food without peculiar. Products are strictly tested to ensure the highest level of compliance to safety standards.400CC CAPACITY - Perfect for use in 1-Gallon Mylar bags and other airtight containers to extend the shelf life of dry goods - grains, beans, powders, pastas, and cereal, as well as dehydrated and freeze dried foods.Double layer and anti oil film designFIVE PACKS OF OXYGEN ABSORBERS - Offered as sets of five, absorbers are packaged and heat sealed closed immediately after production. Never repackaged in order to prevent oxygen exposure and maximize their potency and shelf life. Product description