White Corrugated Mailers When your shipment needs an extra level of protection, tuck top mailers are a great option. They are made from sturdy and durable 32 ECT corrugated cardboard, which makes them super strong yet lightweight to save on postage expenses. Tuck top mailing boxes are perfect and easy to use - they ship flat and set up in seconds without tape or glue. Find those that fit your needs in our wide selection of economically sound packaging options for the retail industry, e-commerce industry, or entertainment industries and make sure your package arrives safely.