There may be times when you may want an insulated water bottle to keep liquids hot or cold. I am loving my Zohirushi bottles. We have two. One is a sippy one that my wife has and mine is a more thermos like one. They both hold 17 ounces. Here's the sippy And the pour one Those are stock photos. I prefer the pour type. I wouldn't use the sippy one while driving anyway. Those bottles keep liquid hot for a long time. After eight hours, it is still burn your mouth hot. I did a long term test where I made hot tea and let it sit for various lengths of time, during which, I would pour some out and drink. After three hours, it is scalding McDonalds in your lap hot. At eight hours, still hot enough to burn your tongue and mouth. But maybe no lawsuit. At twelve hours, it is still too hot to gulp, but great for sipping. At nineteen hours (my longest) with just a capful or two of tea in there, it was still steaming hot, but you could drink it down. It more than exceeds my expectations. Now I am resting to see how long the ice in the ice water mix will last.