The space between the 2 pots is filled with wet sand. The inner pot can be filled with fruit, vegetables or drinks. A wet cloth covers the whole cooling system.

• 2个罐子中间空隙用湿的沙子填充。里面的罐子可以储存水果，蔬菜或饮料。用一块湿的布盖住这整个冷却系统。