Heavy duty, triple-end, double-side construction stacks up stronger and withstands frequent handling. FastFold(R) quick and easy assembly. Reinforced tear-resistant hand holes make box comfortable to carry. Deep, locking lift-off lid stays in place for secure file storage. Smooth rolled edges add strength and prevent paper cuts. Box Type: Fast Fold; Material(s): Paper. Includes 12 storage boxes and 12 lids. Contains100% post-consumer content, 100% total recycled content. 100% recyclable, where available. Please contact your local recycling facility.