What a great water bottle! For the amount of water it holds, it's a great design  Most of them tend to be so wide that they don't easily fit in your hand or traditional cup holders. Being able to hide the spout/mouthpiece is great for placing the bottle in a backpack without worrying about spilling. The lock feature gives a little peace of mind that the spout won't come loose. It also seems to hold up well in the dishwasher. 

My 9 year old son's only objection to this water bottle is that if you take a drink, then hide the spout, then press the button to release the spot again, you get a tiny little splash. Other than that, he said it's the best water bottle he's ever had (and he's has bottles twice the cost of this one!).