So I purchased this S'well Water Bottle and at first I was hesitant to spend around $35 on a water bottle but what the reviews said are really true. It really does keep water cold for really long periods of time. For example, I filled it up with cold water would make it three ice cubes at night, and then I woke up in the morning and it was still nice and cold. I recommend this water bottle purchase. If you buy water bottles a lot while you're on the go. In the long run, you'll save money. Certainly, good to bring to the gym and workout classes. They also come in a lot of different fun patterns so you can get one that, I don't know, fits your personality, if you will. So I definitely recommend the S'well Water Bottle. Even though it's a little pricey for a water bottle, it really, it really is a good investment and will make you drink more water.