Not designed for the speedy ladies
topo rat: 
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.
not for me
mtngirl: 
I live in Colorado at 9,000 feet where big storms come in FAST in the summer. I always like to carry a rain jacket if I am running for more than an hour. With a full camelbak, this pack does not fit even the most compact jacket. If I run for less than an hour, I usually don't take water. This pack is just not for me. It's not bad, it's just probably better for someone in a hotter climate who always needs to carry water.
Your mileage may vary..
Stephen Dunkley: 
The capacity for this device is just right for longer runs 5 to 10 miles.I'm a little large (6 ft, about 220 lbs.)and need the hydration.I used it on a Bartram Trail race (8 miles at 3500 ft. elevation) in NC just two weeks ago.I fumbled with side/cinch straps a little, but eventually figured out how to best use them.It's a good size, but takes getting used to running with a lumbar pack with that much water volume. I think this one is best for fitness walkers and day hikers.It can work for trail runners, but you need to be a decent size (min. 5 ft. 10 in.)and have the strength to carry that much weight (roughly 4 pounds filled) at your center of gravity.If your smaller than the min., I recommend a smaller volume lumber pack or go with a over the shoulders type hydration pack.
Great pack no matter what your size is!
Melanie M.: 
I'm 5'2" and about 110 lbs. and I used this pack for a 15.5 mile hike/run and it worked out great for me. I would recommend this pack for anyone, no matter what your size is!
Love it now, but not at first try.
runvinrun: 
I bought it for marathon training. I already have a Camelbak Catalyst but needed a higher capacity for longer runs (45 oz vs. 28 oz. or 18-20 miles vs 13 miles for me). I'm definitely biased as I prefer Camelbaks over water bottles! The FlashFlo reservoir is way easier to fill and put back into the pack than the Catalyst. The belt tightens in front - another improvement for ease of use. The side-cinch compression system allows one to tighten it as you drink to reduce the annoying sloshing and help keep it from riding around. Two, more than ample zipper pockets for gels, keys, etc. The outer pocket is designed to hold a CD or MP3 player but I don't run with music so I've never tried that feature. It took me two runs to get accustomed to the adjustments. I kept prematurely tightening the side cinches at first which causes the pack to twist upside down. It also took some time to figure out where to let it ride on my back comfortably. I wouldn't recommend it for small people as the filled reservoir weighs nearly 4 pounds. (I weigh nearly 200 lbs.) Once I figured out how to adjust it for my comfort, I really fell in love with it.
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