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Bought this for my then 1 and 3 year old so their milk wouldn't spoil when we went out on hot summer days. The drinks stayed cold for a few hours while we're out and about and didn't have any problems with leaks. Just make sure that the top part of the straw is pulled up nice and tight on the cover. My older one is now 4 and I've bought 2 more for him to bring to school, one for water and another for apple juice (they currently don't have water fountains because of COVID19 so they bring 2 water bottles to school). The size is more suitable for K-2 in my opinion. You might want to invest in a straw cleaning brush, the air hole on the straw can get really dirty if not cleaned on a regular basis. It's been thrown around and dropped by my toddlers countless times and it's still in pretty good condition, I highly recommend this.
I've literally tried all types of water bottles - from cheap to high-end. This is the only bottle that is consistently leak proof, even after hundreds of uses/washes. My only complaint is that the solid-colored bottles shed in the dishwasher (yes, I know you're technically not supposed to put them in the dishwasher but who has time to hand wash?). I have the blue one, and pieces of the blue film around the outside of the metal bottle come off. It took a year or so for this to start happening, but the bottle is now almost completely silver. It hasn't happened with to the bottles with characters printed on them.