700 ML Stainless Steel Vacuum Bottle is a thermos bottle that comes with a double-walled container inside of it. The air between the two walls is sucked out during construction, creating a vacuum. It also contains heating elements that keep hot things hot inside it. It is designed to keep the hot things hot by not allowing heat to escape. 700 ML Stainless Steel Vacuum Bottle is a container that is used to keep hot drinks hot or cold drinks cold. It comes with two thin silvery glass walls between a vacuum.