Kraft bubble mailers are made with a kraft outer layer of paper and layer of durable bubble liner inside. Kraft bubble mailers provide significant low shipping cost and protection for a wide range of delicate items. Constructed with a bottom fold and strong two side heat seals for superior bursting strength. High slip bubble lining allows easier product insertion, saving time and increasing productivity. Hot-melt self seal release liner helps ensure security of your content. Bubble mailers are plain, no printing or branding outside.