Keeps Hot / Cold: The vacuum of the thermos flask's cup blocks heat transfer, keeping your liquids hot or cold for longer. It holds liquid heat above 42°C for up to 6 hours and keeps liquid cooling below 10°C for up to 5 hours—longer than other vacuum bottles. (After 24 hours at 100°C water, the temperature is maintained at about 40°C). The inner wall of the small flask is made of 304-grade food-grade stainless steel, while the outer case is made of high-quality 204 stainless steel. It has been FDA-approved for your drinking needs and is 100% BPA-free.

Hot Flask's Insulated Thermos is designed with a condensation-free exterior to keep your hands dry.

Small Flask with Ultra Capacity Battery: The lithium battery has a large capacity. The screen automatically turns off when not in use, allowing it to last up to 2 years without needing to be recharged daily.