This FFS bagger utilizes rolls of flat polyethylene film from which to form its bags. Small or large bag formats are possible. The machine is highly versatile in possible configuration, able to form a variety of bag types, and may be equipped with a range of filler types to suit product characteristics. Net weigh or volumetric product dosing systems are offered, and bags formed may be pillow, gusseted, flat bottom, 4-cornered stand up pouch type, or vacuum-packed brick type bags.