I was a little bit skeptical about the bite valve top for this water bottle, so I also purchased the same CamelBak (different color) with a regular twist off top as well. Both turned out to be great products, but if anything this one is better. I love the little straw - its easy to use and actually makes me drink more water. The only time its not as great is when I'm working out and breathing really hard and trying to drink out of it.