1. Large volume, light weight, easy to load and unload, can improve loading and unloading efficiency;

2. Simple structure, light weight, can be folded, small space occupied when empty;

3. Low price, high cost performance;

4. It has the advantages of moisture-proof, dust-proof, radiation-resistant, firm and safe, and has sufficient strength in structure;

5. It is generally woven from polyester fibers such as polypropylene and polyethylene.