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An insulated vacuum flask bottle, also known as a thermos or insulated water bottle, is a versatile and practical container designed to keep beverages hot or cold for extended periods. It consists of a double-wall construction with a vacuum-sealed layer in between. The outer wall is typically made of durable materials like stainless steel, while the inner wall is coated with a reflective layer to enhance insulation. This construction effectively prevents heat transfer between the contents and the environment, preserving the desired temperature. These bottles are commonly used for carrying hot or cold beverages such as coffee, tea, water, or even soup. The insulating properties of the vacuum flask bottle allow the contents to stay hot for several hours or keep them refreshingly cold throughout the day.