I run with a camelbak for anything over 8. Well, assuming I'm running by myself and not pushing DS in the jogger (in which case, I just put water and/or gu20 in the stroller). I have a women's specific design (the dream, I think) and I've been pretty happy with it. I thought I would HATE running with a camelbak, but it's really not bad. It's designed to allow some airflow underneath, it's pretty lightweight, and has a few small pockets for things like cell phone, gels/shotbloks/etc, keys.