Zeal X 100% Recycled Poly Mailer Bag are made from 100% recyclable high-quality polyethylene material, which is robust and does not cause environmental problems. Shipping bags are tear resistant, well protected from your products being torn during transportation, and have a reputation for incredible strength and durability. It is also waterproof to protect your products from moisture during transit or storage. Bags are sealed with destructive glue that prevents packages from being tampered with, allowing packages to stay safe and intact all the way to the door of their final destination. But poly mailer is only suitable for non-fragile products, unpadded polyethylene envelopes are suitable for clothing, blankets, scarves.