BOX USA offers a large variety of die-cut corrugated cardboard mailers to choose from. BOX USA White Corrugated Cardboard Mailers 18 x 12 x 6 Inches (L x W x H) are perfect for packing, mailing, shipping and storage of small, fragile lightweight items. These one-piece corrugated mailers fold together in seconds. No tape, glue or staples required. Crush-Proof mailers fold to provide double walls of protection on front and sides. Boxes are sold in bundle quantities and are shipped flat to save on storage space and reduce freight cost. Listed dimensions refer to inside usable carton space.