The torso length is 17". This is a little short depending on your preference. Also, it is a frameless pack with just a slightly rigid foam back panel. I haven't gone out for a run in it yet, but have loaded it up and run up and down the stairs a few times to see how stable it is and it seems like it will be very comfortable. The pack sits a little high on the back (I have an 18" torso), but not any higher than most hydration packs that are designed for running. My fiancee is in LOVE with it though and I have a feeling she will end up commandeering it for any day hikes we do...lol I also ended up taking my Camelbak back to EMS for an exchange. Wound up settling on the Osprey Raptor 10. It's a little heavier than I'm sure most here would like for a pack that size. I haven't put it on my scale yet, but spec weight with the bladder IIRC is 1lb 11oz. However, it's frame sheet and foam back panel are both removable, along with some other misc things I don't need, like a helmet holder, so there is room to shave a few ounces if I want. That said though, this thing so ridiculously stable. A quick tryout with a full 100oz bladder and a couple items loaded showed virtually no bouncing or shifting. It just hugs me perfectly. I have this coming Tuesday off and if I can get a break in the rain, I'm going to try it out on run along the Pemi out to Thoreau Falls. Not sure which pack I will try out first, but I'll keep you posted.