A vertical form fill seal machine, also known as a VFFS, is a common bagging machine used to package goods into bags as part of a production line. Just as the name suggests, this machine starts by helping to form the bag from roll stock. Then, the bag is filled with product and sealed in preparation for shipment.Vertical packaging machines use a single sheet of film material rolled around a core, usually referred to as rollstock. The continuous length of packaging material is referred to as the film web. This material can vary from polyethylene, cellophane laminates, foil laminates and paper laminates.