Size: Poly mailers 14.5×19 inches, 100 pcs. 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: Waterproof bags keep your gifts as good as new. Our envelopes are tear-resistant and won’t break when stretched hard. Convenient transportation: The poly pouch has a thickness of 2.5 mils and is used for soft goods. It is lightweight and convenient for transportation.