...THAT said...

Re: camelbak coolness: Eclectic's got it, as far as blowing the water back into the reservoir. Sometimes that makes me swallow air, though, so to each her own. There are insulation sleeves available, though they might be a hassle.

re: the coccyx: I'm willing to bet it has to do with the gel factor of the saddle, unless you happen to have a prominant tailbone. I'd try a firmer saddle, and angle the nose down by a couple degrees until you find a sweet spot where your sit-bones rest on the padding, but all your weight is borne there. I had no idea how to sit on a saddle 'proper' until reading the Brooks thread... and those saddles will teach you FAST. I'd be inclined to agree with MizKnot. Such parts are not load-bearing structural features.