KKBESTPACK Kraft Self Seal Bubble Mailer Padded Envelopes, #000, 4" x 8", Pack of 50 These popular padded envelopes are sturdily built with bubble lined wall construction for extra port Self sealing bubble mailers provide outstanding low cost shipping protection Light weight for postal savings. Made from 100% recycled content. Seamless bottom affords additional cushioning protection along with greater overall strength and saf 3 side finned design provides added protection