A Thermo Flask is a vacuum-insulated container designed to maintain the temperature of beverages or liquids for extended periods. Constructed with double-wall, food-grade stainless steel and a vacuum seal between the walls, it effectively prevents heat transfer, keeping contents hot for up to 12 hours or cold for up to 24 hours. Features typically include a leak-proof screw-on lid, wide mouth opening for easy filling and cleaning, and a durable, sweat-free exterior finish. Ideal for outdoor activities, office use, or travel, the Thermo Flask combines robust construction with convenient portability.