SELF ADHESIVE – The 7.5×5.5 packing slip pouches feature a self-adhesive backing that allows for strong attaching with no need for tape. TEAR PROOF – The sturdy 7.5×5.5 shipping envelope pouches have incredible durability when shipping postal, USPS, UPS or FedEx. CLEAR WINDOW – The shipping envelope 7.5×5.5 is perfect for enclosing your packing slip, invoice or shipping label for easy identification. Top loading panel on pouch. WATER PROOF – These shipping envelope pouches keep the contents safe from water. Being waterproof, you can have peace of mind that your packing list slip will not get wet if left out in the elements by the logistics carrier.