YOU GET 150 ( 3 BOXES OF 50) POLYMAILER, FLAT, NO PADDING ENVELOPES, SELF SEALING. Polyjacket mailers have a slim profile, but still provide durability and moisture resistant protection. They’re ideal for clothing, soft goods, and documents.eBay Polyjacket envelopes, Polymailer envelopes – 12″ x 15″ L + 3″ flapWhite/silver polyethylene filmSelf-seal closurePolyjacket envelopes are not bubble lined