Jiffy Lite Self/Seal Mailer Size: 10.5"x16" Jiffylite® Mailers. Jiffylite® air cellular cushioned mailers have outstanding shipping protection for a wide range of semi-fragile, low profile items. They contain a Barrier Bubble® layer of Bubble Wrap® brand material that provides maximum air retention and cushioning power. Cost Savings - Lightweight for postal savings Excellent Protection - Seamless bottom affords additional cushioning protection along with greater overall strength and safety Easy to Use - High-slip Bubble Wrap® brand cushioning material allows faster, easier product insertion.