The HappiBottle 350 ml stainless steel portable thermos has double wall insulation to keep your drinks fresh. Keep your favorite beverages cool for up to 24 hours, and your favorite hot beverage warm for up to 12 hours. With its purple matte finish, there's no need to compromise on function and style. Choose from an assortment of colors! Use this as a water bottle at the gym or on the go. GREAT SIZE FOR LUNCH BOXES.