Quality Park Poly Mailer, Redi-Strip, White, 10 x 13, 100 per Box, (46197) Lightweight: These mailers are made from recycled polyethylene so they are lightweight and can help keep shipping costs low REDI-STRIP: No moisture required with this Redi-Strip closure LESS YUCK: We promise you won't miss licking envelopes or crumbly, drippy sponges; complete your mailings, no accessories required POLY MAILER: These 10 x 13 poly mailers are perfect for shipping soft or non-fragile items GREAT VALUE: Conveniently packed in 100 count to reduce the frequency of repurchasing