Extra-strength divider storage box is built for moderate use. Ideal for stacking without shelving. Each storage box includes three 5" corrugated dividers to keep files upright even when the box is partially full. Design features double-bottom, double-end, 1-1/2" side construction for use with or without shelving. FastFold one-step setup makes box assembly fast and easy. Deep liftoff, locking lid stays in place to secure box contents. Each box contains a high percentage of recycled material.