21 x 6 x 2" White Corrugated Mailers. Corrugated Mailers are super strong yet light-weight to save on postage. Perfect for shipping small, light-weight fragile items. Corrugated Mailers are manufactured from 200#/ECT-32-B white corrugated. Crush resistant mailers fold to provide double walls of protection on front and sides. No tape, glue or staples needed. Proudly made in the USA!