1. This ice bag is made of environmentally friendly materials. The product can be reused indefinitely, which is economical, environmentally friendly and water-saving. 2. How to use: Receive the water-filled ice box, open the lid, then fill it with 80% water, no need to shake, put it in the refrigerator and freeze it for 5-10 hours before use. Due to thermal expansion and contraction, be careful not to inject too much water! 3. This product cannot be heated and can be cleaned with household detergents. It cannot be put in the dishwasher for cleaning. Do not deform or damage this product under heavy pressure.