You can use your FoodSaver appliance for re-sealing Mylar-type (strong, thin polyester) or stiff plastic bags. You can re-seal potato chip and pretzel bags, but do not vacuum them as you will crush the contents. Zipped storage bags and other plastic bags cannot be used due to the amount of heat generated when sealing the bags. Doing so may cause damage to your unit.
To reseal a chip bag, first cut the factory seal using scissors or the bag roll cutter. Ensure the open end of the bag is straight and smooth and allow at least three inches of empty space. Press the Seal button and insert the bag into the vacuum channel. Continue to hold the bag while the appliance clamps the bag.