Not designed for the speedy ladies
I bought this pack for long trail runs and almost threw it off a cliff the first time I used it. It may be the best pack ever for hikers, bikers, and male runners, but if you are a female runner with a waist, this pack is balls. When full of water, it either bounced like a jack rabbit or bruised my hips from being cinched too tight. If the last thing you want to do on a run is stop every ten feet to adjust a pack, don't buy this.