You can be confident any merchandise shipped in these extra tough 12 1/2 inch x 19 inch Kraft Bubble Mailers will arrive safely. Made with 50# kraft exterior and 3/16" air bubble interior, these bubble mailers are the ultimate in quality. Light-weight air bubbles also save you money on postage costs. You have a variety of options for closing these envelopes securely you can staple, use packaging tape or heat seal with one of our Thermal Impulse Hand Sealers.  .