Pratt PRA0083 Recycled Corrugated Cardboard Single Wall Standard File Box with C Flute, 15" Length x 12" Width x 10" Height, (Pack of 25) 100 percent recycled corrugated box for packing, shipping, and storing 32 ECT grade for standard stacking performance Shaped to fit North American letter size and A4 size paper Made of single wall C flute corrugated fiberboard with standard kraft color Shipped flat to reduce shipping costs and storage space