We have made further improvements to variable-capacity corrugated cardboard box for ASKUL’ s B to B mail order and catalog order services. Perforations provided on the sides of the box enable adjustments along the vertical folding line, which was previously done with a cutter knife, by a folding process similar to origami with only the hands, while maintaining structural integrity of the box. In addition, A3-sized bottom type box, it can be adjusted from size 80 to 100, with dimensions taking into consideration the charge of delivering one box.