Ton bag (also known as container bag/space bag/flexible container ton bag/multi-pack bag): It is a flexible transportation packaging container. It has the advantages of moisture-proof, dust-proof, radiation-resistant, solid and safe, and has sufficient structural strength. Because container bags are very convenient to load, unload and transport, the loading and unloading efficiency has been significantly improved, and it has developed rapidly in recent years. Container bags are generally made of polyester fibers such as polypropylene and polyethylene. It is characterized by simple structure, light weight, foldability, small space required for emptying, and low price.