Poly mailers are lightweight but sturdy plastic bags designed to ship products. They have a self-sealing foldover lip so no tape is needed, and a shipping label can be directly affixed on the bag. They are thin, yet durable so they don’t take up much space on a truck while in transit.Poly mailers come in many sizes and styles with some being padded with bubble wrap so they don’t require additional dunnage like many boxes require to hold items in place to prevent shipping damages.