I bought my hydration backpack several years ago when i was training for half marathons. I really like using it on my road bike on rides longer than a couple of hours. It's just a lot easier to use and keeps the liquid cooler for a long period of time.

A few years ago I did the Ride Across Indiana which is a 160 mile 1 day ride. During all of my training and on event day, I put electrolytes and Perpetuem in my water bottles and put water in the CamelBack. It worked great for me.

Some roadies will argue that "REAL" roadies don't use CamelBacks, so I guess I'm not a "REAL" roadie. Sorry, I don't have a support vehicle to do hand ups when I'm out on the backroads doing my training. It would be cool if I did though.