PACKZON Poly Mailers Envelopes Premium Self Sealing Shipping Bags (6 x 9 Pack of 1000) DIMENSIONS: Width 6" x Length 9" do not include 2" flap. MATERIAL: Three layer co-extruded polyolefin (polyethylene) film. Material is waterproof, seal is not. FEATURES: White outer surface &amp; silver inner layer provides confidentiality. Labels adhere easily, SPECIFICATIONS: Acid free