100 #4 (9.5" x 14.5") Kraft Bubble Mailer Bags Fully laminated kraft and air cellular construction provides outstanding stiffness and puncture resistance Light weight for postal savings. Made from 100% recycled content. Seamless bottom affords additional cushioning protection along with greater overall strength and safety. High-slip bubble cushioning materials allows faster, easier product insertion. Convenient self-seal closure saves labor and eliminates the need for staples and tape, while forming a water-resistant, secure package.