Every body is different, so YMMV.

I tried on every single backpack that REI had in stock in a store in Cali and a local outfitter - mens and womens. I ended up with a Osprey Ariel. It is not even close to ultra light and has lots of ... do-dads, which I like Price was more than I wanted, but being a cheapskate, this is normal for me.

I ended up buying this from a local business and they helped fit it for me, the had a hip belt "baker" but they said they had better luck with the individual just wearing it and body heat forming it.

I'm very happy with it, but you have to try backpacks on to find the correct fit.

Good luck!