Abstract: Cigarette cartons are boxed by a case packer comprising a frame mounted on a base, a feed unit supplying collapsed box blanks, a station at which the boxes are packed, a feed unit by which the cartons are directed along a path running perpendicular to a feed path followed by the blanks, also first and second folding and closing assemblies by which the top end face and the bottom end face of the erected box are formed. The machine base affords a plurality of mounting points arranged symmetrically on either side of a vertical median plane, passing longitudinally through the base, so that the position of the feed unit can be reversed in mirror image relative to the median plane, as also can the positions of the first folding and closing assembly and the second folding and closing assembly.