I only started using a Camelbak last year, but now I wouldn't go out without it in the summer. I always thought it would drive me crazy because it would feel hot on my back, but my riding buddy had one and she said, "Well shoot, it's just hot, whether you're wearing a Camelbak or not." Turns out she was right--it doesn't feel hot at all, and in fact, it feels quite comfy for a while, since I fill it with as much ice as I can cram in there, then add water. On rides of up to 40 miles or so, the water is stays fairly cool--and that's in Florida in the summer!

Like many others, I only use the 'bak for water and put Gatorade in my bottles. Yep, I'm a Camelbakker. BTW, I also have the Dream.

For any kayakkers out there, Platypus makes a similar product that attaches to the rear deck of your boat so you can route the tube over your shoulder and have cool water while you paddle.