With over 1, 500 sizes available Boxes Fast offers a large variety of packing boxes to choose from. Boxes Fast BF40188 single wall corrugated cardboard boxes 40 x 18 x 8 inch (L x W x H) are ideal for packing, moving, shipping and storing goods. The single wall C-Flute corrugated fiberboard provides structural strength and crush resistance; making these cartons a durable choice for all packaging needs. Boxes are sold in bundle quantities, and are shipped flat to save on storage space and reduce freight cost. Corrugated cartons come in the standard Kraft color, and are made of recyclable cardboard. Listed dimensions refer to inside usable carton space.