A bag making machine continuously drawing and propelling tube stock from a supply in a roll, including an in-feed conveying mechanism having feed rolls drawing the tube stock from the supply, a horizontal belt conveyor with spaced individual belts carrying the tube stock in horizontally laid out condition, a continuously moving cutter mechanism including clamping jaws above and below the tube stock on the belt conveyor, the lower jaw having slots receiving the belts therein, the upper and lower jaws having stationary and yieldable jaws to grip, clamp and stretch the film, and the upper jaw having a cutter moving downwardly in a slot into a corresponding slot in the lower jaw; a crimper to longitudinally corrugate the tube segments severed from the tube stock and shoot the severed tube segments across the receiving end of a crossfeed conveyor mechanism which changes the direction of the tube segments, the crossfeed conveyor mechanism including a roller conveyor to receive and carry the tube segments transversely from their first direction of movement, weighted balls aligned along adjacent ends of the rollers in the roller conveyor; a moving fence against which the edges of the bags engage at the crossfeed conveyor, the crossfeed conveyor mechanism also having a belt conveyor with spinning balls superposed above belts at the edges of the tube stock and guiding the tube stock into a high speed sealer along one side of the belt conveyor, and the belt conveyor supplying the bags formed from the tube stock into superposed upper and lower stacking conveyors alternately directing a number of bags onto accumulating conveyors.