Kraft Bubble Mailers provide a protective cushioning when shipping fragile items. The air filled bubbles inside the mailer help soften the impact of handling while your package is in transit. Features our Redi-Strip® closure-no moisture required. Just pull off strip and press to seal. Seam Type: Center; Flap Type: Square; Opening: Open End; Envelopes/Mailers Closure: Redi-Seal™ Adhesive.