3 Mil Poly Mailers Envelopes Bags, 12x15.5-inch, Self Sealing Mailer, 500 Bags, White/Grey TEAR PROOF - The 3 Mil thick 12x15.5 white poly mailers have incredible durability when shipping postal, USPS, UPS or FedEx. WATER PROOF - These poly mailers 12x15.5 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 12x15.5 are very lightweight, which keeps shipping cost at a minimum. SELF ADHESIVE - The 12x15.5 mailers feature a self-sealing peel off strip that allows for super quick closing with no need for tape. PUNCTURE RESISTANT - The poly mailer 12x15.5 plastic envelopes are very durable and prevent punctures, rips and tears. The 12x15.5 poly mailer bags make shipping catalogs, clothes, t-shirts, blankets, fabrics, odd-shaped items, scarves, accessories, etc very easy.