California Office Supply- 50#5 10.5x16 KRAFT BUBBLE MAILERS PADDED ENVELOPES #5 Outside Demension is 11 1/4"x 17" and inside demension is 10 3/8" x 15 1/8". (variation +/- 1/5") Sturdily built with bubble lined wall construction for extra protection during transit. Self Sealing Bubble Mailers provide outstanding shipping protection. Seamless bottom affords additional cushioning protection along with greater overall strength and safety. Fully laminated kraft and air cellular construction provides outstanding stiffness and puncture resistance.