I already have the larger, solid version of this bottle & that's so good it's always being taken out of the house by other members of my family, so I needed another one for the gym.
That's when I came across this. It has the same no leak Camelbak bite valve and a removeable internal straw, so you can drink from it vertically or with your head tilted back, whichever is your preference.
The advantages of this bottle over the Camelback solid version is that it is slightly smaller, so fits in the gym equipment holders easier. It is made of lighter, flexible plastic, which you can squeeze for faster water flow. And it is cheaper, but still of the same Camelbak quality.
The solid bottle's bite valve flips down to close the flow, whereas this bottle twists to close and the bite valve remains upright, I prefer this for sports & training as it is constantly in use and the closing mechanism seems to be more watertight for chucking in the gym bag.
Overall I'm really pleased with it & I'll be buying more.