Poly Mailers Item Code: Type: Sold By Quantity Mailers Poly Mailers Self-Seal Description These Poly Mailers are used to ship medium weight items; tough, water and tamper resistant; the pressure sensitive, self-seal adhesive, closure system is reliable, tamper-evident and easy to use; anti-static release liner peels off quickly; easy to load contents and seal package. Ink, stamps, and labels adhere easily to the surface.