Sealed Air 10122 Sealed Air Jiffy TuffGard Extreme Cushioned Mailers, 8-1/2x12, White, 50/Ctn White shipping mailer features a self-seal closure and a Bubble Wrap cushioning. Twice the cushioning and protection of traditional cushioned mailers. Combines the protection of 5/16" thick Bubble Wrap brand cushioning with strong, co-extruded film for increased bursting strength. Lightweight Barrier Bubble technology for greater air retention. Self-seal closure is tamper-evident.