a conveyor system for gripping and transporting plastic film is disclosed in the environment of a packaging machine and process for loading bags of a novel web of side connected bags . the web is fed through a bagger section by a pair of grooved main transport belts and a pair of lip transport belts each disposed in the groove of the associated main belt to trap bag lips in the grooves . adjustable belt spreaders space reaches of the transport belts as they move through a load station whereby to sequentially open the bags into rectangular configurations . alternate conveyor embodiments are also disclosed . the belts of each embodiment are constructed such that when force is applied to a gripped plastic film coaction of the film and belts causes the belt gripping of the film to tighten .