A system for packaging items in a custom sized box comprises a blank forming apparatus for forming a custom sized blank and a box folding apparatus for folding a custom sized box from the custom sized blank. The box folding apparatus comprises a rectangular throat frame having an adjustable rectangular throat opening and a suction device with suction nozzles for sucking the bottom panel of the blank. A displacement device is provided for lowering the suction nozzles from a top position in which top surfaces of the suction nozzles lie in a plane supporting the blank towards a bottom position, thereby causing folding of the side and end panels of the blank with respect to the bottom panel as the blank is drawn through the throat opening.