I bought it to give to the place I donate to give the used clothes to overseas. The specified size was 140 cm, but it was surprising at first that it was too big. But I could put items in a box and send it.
I bought 20 cardboard boxes in search of cardboard as big as possible on the net. There was also sufficient strength and if you combined 2 boxes, you could pack large aircraft. Model airplanes and others are lightweight, bulky, so if you have a slightly larger size you will be saved.