20 Pack of High Quality Blue 10 x 13 Self Sealing Mailers. Awesome color!.. Stand out from the crowd! These Beautiful Poly mailers save on postage and are Water, Tear and Puncture resistant.High strength seams allow for over-stuffing For a variety of items. We use the mailers we sell, so we know how great work!!All of our Poly Mailers are UPS, FedEx & USPS APPROVED. U.S SELLER!!.. FAST SHIPPING!! Add a map to your own listings. FREE Trial!