The Exp letter/legal box 12-pack provides you with plenty of storage for your records. The EXP30020 is a medium duty box and features a sturdy corrugated cardboard construction with a 650-pound stacking weight. The EXP30020 is designed for use as storage on shelving units. With built-in perforated handles moving your files is a breeze. There is even a spot on the EXP30020 to keep tabs on your records by filling out the From, To, Box #, Destroy Date and Contents.