Pen+Gear Poly 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 and the water-resistant poly material stands up to the elements. Each shipping envelope has a quick and easy Peel & Seal closure—no moisture required. Just pull off strip and press to seal. Keep shipping costs low with lightweight mailers that require less postage than shipping boxes.