• 2.0 MIL Quality Self Sealing Mailers.• Self Sealing Poly Courier Shipping Mailers!• UPS, FedEx & USPS APPROVED• Superior tear and puncture resistance.• Just Peel-and-Seal• Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant• High-efficiency mailers are perfect for shipping a wide variety of non-fragile items.• Water, Tear and Puncture resistant.• Lightweight saves on postage• High strength seams allow for over-stuffing.