I actually have one of those MSR dromlite bags and I'm thinking about shoving it in a front pannier or strapping it to a rack and then rigging up a camelback style hose to it. They sell kits for them, but the hose won't be long enough out of the box. That way I can have water whenever from a straw, without any extra weight on my back. Then again, I'll probably just go with bottles and refill them from the dromedary bag...