Sealed Air 49675 Jiffy TuffGard Self Seal Cushioned Mailer, #4, 9 1/2 x 14 1/2, White (Case of 25) White polypropylene shipping mailer features a self-seal closure and a Barrier Bubble air cellular lining. Puncture-, tamper-, and water-resistant. Heat-seal seams. Lightweight Barrier Bubble air cellular lining.