Cello Flip Style Stainless Steel 500 Ml Flask hot for the significantly extended time. Utilizing this property, it works magically in the summer season. You can carry cold water anywhere in your Cello flask. The water will remain cold. There is no better thing than quenching the thirst with cold water in summer, especially when you are out of your sweet home. More to it, you can get your name on it to make it more personal.