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HAVISDECOR A vacuum flask, also known as a thermos, is a double-walled container typically made of stainless steel or glass. It consists of an inner flask and an outer flask separated by a vacuum layer or a layer of insulating material. This design minimizes heat transfer by conduction, convection, and radiation, allowing it to keep beverages hot or cold for an extended period of time. The flask usually has a lid with a stopper or a screw cap to prevent heat exchange with the surroundings.