I have a compact frame and don't care to wear a camelbak. For longer rides or rides in the heat, I have a behind-the-saddle bottle holder that holds two bottles back there. It takes some practice to get used to, but I like it. Now that the bottle holder is back there (though currently it is off, as it's not quite hot enough to bother with), i have to find a different way to hang my bike bag, so I rigged it so that it hangs on the inside of the frame, where the other bottle holder would be if it could fit. I can post pics if you are interested in the setup...