bout this product Designed to protect mailed items from damage and prying eyes, the Laddawn's tear-resistant and durable poly mailer is built from coextruded poly to withstand overstuffing and wear and tear of shipping. This opaque poly mailer has a white outer surface and silver inner surface for added security. Usable inside dimensions: 20"W x 24"L Outside dimensions: 20"W x 24"L, 4" bottom gusseted Tamper-evident with a permanent self-seal adhesive strip for easy closure Opaque poly mailer is manufactured to be white on the outside and silver on the inside Durable 2.5 mil mailer is made of low-density polyethylene