These light weight poly mailers self seal for easy and secure packing. Each Large Plastic Poly Mailer is 12" x 15.5" in size. Our Poly Mailers are extremely durable and lightweight to help save you money on postage. Superior tear and puncture resistance. High strength seams for maximum protection. Silver lining inside keeps contents hidden from view. Surface easily accepts ink, stamps, and labels. Approved by shipping carriers. The lightweight poly mailing envelopes are perfect for sending small items via Fedex, UPS, USPS, or DHL. The self-sealing adhesive makes packaging your items for shipment fast, easy, and secure.