Ocharzy Self-Seal Kraft Bubble Mailers Pack of 50 (5.5''x6.3'') Bubble Mailers,100% Brand New,from Ocharzy. Material:kraft paper+bubble film. Size: 5.5 x 6.3 + 1.7 Flap. Self sealing bubble mailers provide outstanding low cost shipping protection for a wide variety of products. Very durable, flexible and lightweight.