The perfect combination. Our 32 oz. Flip Top Flask + the 32 oz. Tumbler. Both feature double wall vacuum insulation, stylish and rugged design and both will keep your drinks hot or cold for up to 36 hours. The Flask is great for hiking, camping or other outdoor activities. The tumbler is perfect for on-the-go hot or cold beverages at work, in the car (fits perfectly in your cup holder) or at home!