All stated dimensions are length x width x height. 500 x X-Large Single Wall Packing Cardboard Boxes 24x18x18". Perfect for large size items, and a good size for warehouse/ dispatch use at an economy price. Very popular with cash and carry style stores and online sellers. Is also a popular single wall carton used in lighter removals and moves for light items. We would recommend a combination of these and double wall boxes for a house or business move, as single wall boxes should not be used for very heavy or delicate items, and do not stack as well as double wall boxes when stored.