Since we are talking about the Carbon Fiber Race Case, may I ask what brand and model of bladder you are using with it? I have a Camelbak with a detachable hose, and the hose doesn't fit through the hole of the race case. More precisely, the hose itself would probably fit, but the end piece of the hose is slightly too wide (not the mouth piece, but the piece at the other end of the hose that connects to the bladder). So I either will have to make the hole of the case slightly bigger, or modify the end piece of the hose.
Did you have this problem? Does any hydration system fit the race case out of the box, and if so, which make and model are you using?