Vacuum Flask is a container with excellent thermal insulation performance. The vacuum flask adopts a double-layer structure. A vacuum is formed between the two containers, which significantly reduces heat conduction and heat convection, making it able to effectively maintain hot and cold drinks. temperature. Most vacuum thermos bottles adopt a sealed design to prevent liquid leakage, making them easy to carry every day. The vacuum thermos bottle is a convenient and environmentally friendly beverage container that can improve the quality of life.