Size: 10×13 inches,100 pcs in total. Protect Your Privacy: These poly mailers are white outer surface and black inner lining, so its opacity prevents prying eyes. Strong Adhesive: Closure seals of the poly package is not ability to open before packaging arrived, the hot-melt adhesive can maintain strong stickiness throughout the year,you no need reinforcement tape. Waterproof and Durable: Waterproof poly mailers keeps your gifts as good as new, our poly mailers are tear-resistant and won’t break when stretched hard. Convenient Transportation: This poly mailers bags are 2.5 mil thickness for shipping soft-goods,it is lightweight and easy to transport your items.