Thermos bottles can be divided into three categories: 1. Also known as thermos bottle. Mouth diameter small, good insulation performance, mainly used for holding boiling hot water, Fried hot Chinese medicine juice, hot drinks and cold drinks. (2) big mouth. Commonly known as ice bottles. The mouth diameter is large, and the goods are easy to take and put. It is mainly used for ice cubes, ice cakes, cold drinks with containers, refrigerant, liquid gas, anti-fermentative substances, etc. It can also be used for hot food, hot drinks with containers, etc. (3) cup type. Also known as thermos cups. Mouth diameter large, small capacity, mainly used for a short time to reduce the impact of ambient temperature on the contents of the diet.