Ocharzy Self-Seal Kraft Bubble Mailers Kraft bags, Pack of 50 (6x7 inches) Bubble Mailers,100% Brand New,from Ocharzy. Material:kraft paper+bubble film. Color: Yellow kraft ; Size: 6" x 7"+1.7"Flap These popular Bubble Mailers are great for mailing items and they are sturdily built with bubble lined wall construction for extra protection All those make the Bubble Mailer very durable, flexible and lightweight.