Storage box provides heavy-duty stacking strength for letter-size or legal-size patient end tab files. Multilayered construction offers 25 percent more stacking strength than other brands for archiving medical files. FastFold One Step Setup makes box assembly fast and easy. Deep locking lid keeps contents secure. Reinforced hand holds are tear-resistant. Storage box is built for heavy daily usage and maximum stackability. Ideal for stacking without shelving. Stacking weight is 950 lb. Storage box contains a high percentage of recycled material.