I live in Texas (can't get much hotter) and I find the women's Camelbak Mule to be very comfortable. It vents shockingly well and ables me to carry 96 oz. I have worn it on the trail when it was 95-100 degrees and was pleased with the venting, you are going to be hot no matter what at that temp but the channels in the back make it tolerable.
I previously had a Camelbak from 2004 without the channels and it was pretty miserable in the summer, I think some improvements have been made that might be worth checking out. I have seen people with bottles on the underside of the downtube, looks like you would just lose the bottle.
Last edited by Aggie_Ama; 02-23-2009 at 01:53 PM.
Amanda
2011 Specialized Epic Comp 29er | Specialized Phenom | "Marie Laveau"
2007 Cannondale Synapse Carbon Road | Selle Italia Lady Gel Flow | "Miranda"
You don't have to be great to get started, but you do have to get started to be great. -Lee J. Colan