Protective, Customizable and Environmentally Friendly Mailers. These are not just your average mailer. The first thing your customers see is packaging. Get a mailer that represents the quality of your brand. Streamline your parcels, no assembly, no hassle, no problem. This mailer features a tamper-evident secure closure that will not open during shipment. It also has a convenient E.Z. open tab that eliminates the need to use sharp utensils for opening. Plus, it provides the ultimate strength to protect your product during shipment. Made from recycled board and available in FSC® certified materials. Ship your materials flat, or the Conformer® mailer expands to accept a book, or any other bulky item.