ValueMailers 12x15.5" White Poly Mailers Bags Envelopes (100 Pack) High Quality Self Sealing Poly Mailers Water, Tear and Puncture resistant. USPS, UPS, FedEx and DHL approved. Self-stick stamps and labels adhere easily and securely High-efficiency mailers are perfect for shipping a wide variety of non-fragile items. Lightweight to save on postage