Scotch Bubble Mailers feature a lightweight bubble cushioning for protecting your contents. Kraft paper exterior provides an ideal surface for your mailing labels. Self-sealing adhesive closure creates a strong, tamper-evident seal. Durable mailers are bulk-packed to keep an ample supply easily accessible. They are size 4 for objects and documents that will fit inside a 9-1/2" x 14-1/2" envelope.