Doesn't camelpack make an insulation line to wrap your hose?
Yes, but it is not enough to keep your hose from freezing. I am using it. I suspect in warmer climates, like the PNW and California, maybe the insulated hose is enough most of the time. In Colorado, where the temps are usually in the teens or twenties, it's instant freeze. I suspect it has a lot to do with the fact that the hose doesn't ride high and tight against your body like it does in the should strap. So cold air surrounds it. I know I am breaking the rules, but I am pretty confident that this is a rule I can break.