These string and button boxes, made with 250# durable, white corrugated material, are perfect for storing legal and letter sized folders as well as checks (check size made with 200# white corrugated material).  Overlapping flaps are firmly secured with heavy-duty ties wrapped around plastic eyelets and pre-printed content identification forms printed on both ends of the box make it easy to store and organize your files, even when they're stored in boxes!