Sorry I'm late..but I wanted to chime in and say I've had the Profile Design Aqua Rack before, and it didn't last very long at all. The plastic of the water bottle holders broke after maybe a few months of use putting bottles in & out. Also, the screws holding the bottles to the seatpost mount kept unscrewing and loosening after every single ride.

So I don't recommend it! At the same time this happened a few years ago, so it's possible they've made them better/stronger since then.