a plastic or other film bag is formed from a continuous extruded tube . the tube is flattened and sealed across its width at intervals to form bag bottoms . the bags are joined to one another at a perforation line and folded in thirds lengthwise prior to being rolled into a compact roll , either with or without supporting core . after folding the bags may be chisel cut through the center of the perforation line to assist in dispensing of the bags . the chisel cut will extend through all layers of the bag when folded , resulting in three chisel cuts in the bag . the bags may be gusseted for part or as much as all of their width . the bags may also be corona treated and printed on their outer surfaces . the bags may be formed from partially recycled materials and various combinations of linear low density , medium and high density polyethylene .