Great for riding!
I really enjoy the CamelBak that I purchaced from backcountry.com. I use it when I go on mototcycle rides to stay hydrated, and now alot of people are getting them. It holds enough to keep water cool inbetween stops. I enjoy the ease of the large fill port. Also the pack has enough extra space to keep sunglasses, keys, cellphone, and a small snack.