I have one of their 750ml Camelbak bottles. (seen below) In my non-adjustable cage, it just *barely* fits. I have to shove it in there fairly hard but it holds it. I just have to be careful not to fall off the bike while I pull it out of the cage while riding. The shape of the bottle flares out a ltitle in the middle, which is why it fits so snugly in the cage.

I like how the bottle functions. It comes with a straw so I can sip water from it while it's upright so I don't have to tip the bottle back. That's helpful when drinking while riding since you can still keep an eye on the road. What I don't like is that the top of the water bottle is leaky. I don't know if I have a defective one or not, but whenever the bottle's in my bag, it ends up leaking water.

On a related note, I'm getting paranoid of bacteria growing in the mouthpiece part of the bottle but I'm not sure how to clean it. Any suggestions would be nice.