As a mom of 3 and part of a very active family, I I have several brands of water bottles because it matters in the Florida heat! This bottle held up a drop , overnight ice retention. I left the bottle with about 1/4 parts ice and half filled bottled overnight; ice was about 70% melted. Pretty impressive. Outdoors, the water will stay very cold if the water/ratio is perfect. Very easy to clean and I love that a brush was included. If left on its side, it will leak a little bit, but very few products are actually leak-proof. I would purchase this for my two other kids.