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Oxygen absorbers are used to protect packaged foods and other products against spoilage, mold growth, color change, loss of nutritive values, insect damage and loss of quality. By removing residual oxygen inside packaging to below 0.01% this 900CC oxygen absorber effectively preserves packaged foods without the need for food additives/preservatives and without the need for vacuum sealing. For use in half-gallon (or larger) Mylar bags