Ship your items safer with a Barrier Bubble® lining that retains air better than alternative cushioning materials. Constructed with a natural kraft exterior that doesn't require bleaching or dying to create an "unnatural color" like gold or white. Easy to write on or attach a shipping label. The fully laminated natural kraft and air cellular construction provides outstanding stiffness and puncture resistance. Self-sealing. Seam Type: Side; Flap Type: Square; Trade Size: #2; Security Tinted: No.