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This barrier bag is ideal for storage of materials sensitive to moisture and/or oxygen. The inside dimension measures 6 x 5.5" with a zip lock and a tear notch above the zipper. The material is a metal foil-covered 4mil polyethylene with a MVTR (moisture vapor transmission rate) that is 1,000 times better than a typical poly bag. It is heat sealable and ziplock resealable.