seal formation performed by the sealing jaws 126 the sealing jaws 126 provide three functions simultaneously first they make a bottom transverse seal 131 to form an open ended tube above the sealing jaws 126 second they form a top transverse seal 133 to close the open ended tube and thereby from a closed package below the sealing jaws 126 third they provide a cut 130 between the top transverse seal 133 of the closed package below the sealing jaws 126 and a bottom transverse seal 131 to an open ended tube above the sealing jaws 126 once the sealing jaws 126 have provided a bottom end seal 131 to form an open ended tube the open ended tube is pulled downward by drive belts 120 or other means a bag straightening device 300 then engages the open ended tube the purpose of the bag straightening device 300 is to prevent the open ended tube from twisting or rotating below the fill tube about the fill tube axis prior to transverse seal 131 133 formation it should be noted that the undesirable rotation occurs when the weight of the product placed into the bag exceeds a certain threshold the product density of tortilla chips and potato chips causes this threshold to be exceeded when the end seal length l greater than about 10 inches however other products may cause this threshold to be exceeded at other lengths prevention of such rotation reduces or eliminates pleats and promotes a substantially symmetrical gusset 180 about the crease line 176 depicted in fig2 a a substantially symmetrical gusset 180 lessens gusset variation and aids package stability fig4 a is a perspective view of a bag straightening device 300 in accordance.