Poly Mailer is designed to provide maximum protection and has excellent puncture resistance. Poly Mailer is made of polyethylene film. The specialty about Poly mailer is that they are water, puncture and tear resistant. Poly mailers have a white outer surface and a silver interior lining to provide excellent opacity. Self-seal lip and tape provides quick and easy closure. Poly Mailers are available in variety of sizes. PackagingSuppliesByMail.com carries all kind of packaging supplies needed for daily purpose as well as for industrial use.