Vacuum bottle is a container that keeps liquids hot or cold for many hours. It is also called a Dewar flask or a Thermos bottle, which is the trademark for a brand of vacuum bottle produced by the Thermos Company. Vacuum bottles vary widely in size, ranging in capacity from 2 ounces (59 milliliters) to 15 gallons (57 liters). They are commonly used to carry coffee, juice, milk, or soup. Some types of vacuum bottles are used in scientific work to store chemicals and drugs, to transport tissues and organs, and to preserve blood plasma.