10x13 Poly Mailers Shipping Envelope Mailer Bags, 10 x 13 inch, Peel & Seal, White, 500 Pack TEAR PROOF - The 3 Mil thick 10x13 white poly mailers have incredible durability when shipping postal, USPS, UPS or FedEx. WATER PROOF - These poly mailers 10x13 keep your contents safe from water. Being waterproof, you can have peace of mind that your products will not get wet if left out in the elements by the logistics carrier. LIGHTWEIGHT - These 3 Mil mailing bags 10x13 are very lightweight, which keeps shipping cost at a minimum. SELF ADHESIVE - The 10x13 mailers feature a self-sealing peel off strip that allows for super quick closing with no need for tape. PUNCTURE RESISTANT - The poly mailer 10x13 plastic envelopes are very durable and prevent punctures, rips and tears. The 10x13 poly mailer bags make shipping catalogs, clothes, t-shirts, blankets, fabrics, odd-shaped items, scarves, accessories, etc very easy.