Patented cardboard storage box. The bottom has a double layer construction and a 3-layer construction on the sides, so it can be stacked up to 6 levels. The main unit and lid are integrated and easy to use. It can also be folded up for storage when not in use. Storage Uses: Approximately 38 CDs, Product Name: Maruai Storage Box, Tough Box, For CDs, Holds Approximately 38 CD, CA-CD