Nalgene is Durable!
I own lots of Nalgene bottles of different sizes and this one is nice and small. My kids use it and love it. I also keep it next to my bed in case I get thirsty during the night. I've had a friend shoot his old one with a shotgun and it to 2 shots to put 1 tiny crack in it! I threw one full of water off a 70ft cliff and it didn't break! That is durable! :)