Ad*Star bags are heat-sealed polypropylene bags (no glue or stitching). These bags can be produced with valves or open mouth. They are widely known as Block Bottom Valve Bags. These bags deliver excellent performance wherever high-speed filling processes are used. The development of a new sack concept was started by Starlinger in 1933. The idea was to take all the advantages of the traditional sack and combine them all into a new product, and that’s how Ad*Star Bag was born.