Kraft Bubble Mailers #5 -16 X 10.5 Padded Envelopes, Self Seal (Pack of 20) Pack of 20 self-sealing bubble mailers. Bubble-lined wall construction provides cushioned protection for your mailings. Size #5 (16" X 11.5") - Usable space: 15.5" X 10.5" Made from recycled materials. Kraft paper. Made in the USA,