Yeah, I use the 24oz camelback podium big chills, usually freeze one completely, and the other half way...but still, when the temps are high, I can easily drink one an hour if I'm really hammering away. This means, if I'm out longer than two hours I need to find water...which usually results in nasty hot water out of a drinking fountain.

I'll try the jersey and see how it works out, the insulated bottle shouldn't be too damp on the back.