Pastry Bag refers to a a cone-shaped bag with a hole at the narrow end. Decorative toppings, purées, etc., are squeezed through this hole. Food is placed into the large opening then squeezed out the small opening which may be fitted with a decorator tip. It has a variety of uses, including decorating cakes and cookies, forming pastries, or piping decorative edgings. Bags may be made of cloth, plastic, or other materials.