FoodSaver® Rolls have all the same great features as FoodSaver Bags, plus one. Rolls allow you to make custom size bags so you can always have just the right size bag on hand. Simply cut to the desired length and seal one end with your FoodSaver appliance, and your custom-sized bag is ready to use. Most FoodSaver users like to keep both bags and rolls handy for the greatest packaging convenience and flexibility. You will need a FoodSaver Vacuum Sealer, separately, to use these Bag Rolls. They are compatible with the FoodSaver V845.