Medium-duty storage boxes with lids offer 30 percent greater stacking strength than other brands. Ideal for storage with or without shelving. FastFold One Step Setup makes box assembly fast and easy. The 35 percent deeper liftoff lid stays in place to secure box contents. Smooth, rolled box edges add strength and help prevent paper cuts. Storage boxes are built for moderate use and high stacking needs. Stack up to five units high. Average amount of evenly distributed weight that can be safely stacked on top of box is 650 lb. Each storage box contains 65 percent recycled material with 50 percent post-consumer material.