50 River Fish 10" X 13" Unpadded Poly Mailer Envelopes Durable, thick 2.5 mil plastic, tear-resistant and waterproof; 100% Recyclable Self-sealing strong adhesive closure for quick peel and seal packaging Ideal for packaging t-shirts, sweatshirts, and other non-fragile items Create a memorable customer experience with these high quality designer poly mailers Create a memorable experience for your customers by using these premium quality designer poly mailers. They are thick, durable, tear-resistant and waterproof, with a strong self-sealing adhesive for easy peel and stick packaging! Count: 50 Pack ~ Size: 10x13 Inch ~ Design: River Fish ~ Material: Durable 2.5 Mil Polyethylene ~ Product: Unpadded Poly Mailer Envelopes. 100% Recyclable.