The full name of the container bag is flexible container bag, also known as big bag, ton packing bag, is a kind of soft packaging containers, is made of foldable adhesive coated cloth, resin processing cloth and other soft materials made of large-volume transportation bags. It is generally made of polypropylene or polyethylene as the main raw material, extruded into film, cut, drawn, then woven, cut and sewn. The use of such packaging is not only conducive to improving the efficiency of loading and unloading, especially suitable for bulk powder and granular goods packaging, and is conducive to promoting the specification of bulk goods packaging, serialization, reduce transportation costs, but also has the advantages of easy packaging, storage and low cost.