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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 actually hate this bottle. It leaks, it's annoying to clean, and it is poor quality. I emailed the company regarding the leaking, and they didn't seem to care. Too bad, so sad. I bought the thermoflask bottles for my toddler from Costco instead - the quality is 100 times better and it doesn't leak Waste of money.