5L x 5W x 5D Corrugated Cardboard Box, Cube Box, 40 ECT Box, Kraft (25 Count) Strong, durable, 100% recycled small corrugated boxes are ideal for packing, shipping, and storing fragile and heavy items. These heavy duty boxes are 40% stronger than standard shipping containers. Sold in bundle quantities and shipped flat to save on shipping fees and storage space.