Bubble mailer bags are envelopes lined with bubble wrap for extra protection . They come in an extensive range of sizes, commonly rectangular in dimension. Bubble mailers are made from plastic or paper and are extremely durable, lightweight, flexible and space efficient . Poly bubble mailers are made from polyethylene plastic, which is the most commonly used plastic in packaging, and is lined with bubble wrap for extra cushioning. It is water proof, durable and a very popular option for shipping smaller and more fragile retail products .