The REVOMAX water bottle keeps drinks hot for 36 hours and cold for 18 hours, and features a convenient one-touch open/close cap. - Brand: REVOMAX - Capacity: 20 oz (592 ml) - Heat Retention: 36 hours - Cold Retention: 18 hours Thank you for looking. I received this as a graduation gift, but I don't use it, so I'm selling it. The box has some stains. It is unopened.