Originally Posted by chance0128
Unless you are going to be riding in an aero position or time trialing, I find that a Camelback or other hydration system is great when you don't have a cage on your bike. I can hold 50 oz of water in mine and it adds about a 1.5 inch hump on my back. It's not going to stay cold though.
Actually, I think it might help in an aero position, since it could potentially act as a fairing behind your head. I think Jan Ullrich or someone wanted to use one in a TT, and there was some controversy about whether it would give him an unfair advantage.