Available Sizes:#4 9.5 x 14.5 Inch (9.5 x 13.5) Easy to use: self-sealing, adhesive and easy to be peeledSelf-sealingFully laminated water proof Poly materialMailers are plain, no printing or branding outsideLightweight to save on postageStrong seams with fins on two sides and a seamless bottom provides maximum protection. Surface easily accepts ink, stamps, and labels. Approved by USPS, FedEx, UPS, and DHL.