I'm trying to find a UL bag for my wife to use on the A.T. I myself am going with the Osprey Exos 58. Now I know men's and women's bags are supposed to be different, key word, supposed to be. If this is the case, then Osprey does not offer much of a selection. The Exos 58 offers 3700 CI and only weighs 2/10. All the other womens' bags weigh anywhere from 2/9 to almost 6 lbs! I'm wanting to get pretty much the same thing, not necessarily an external frame, but something along the lines of the same space and weight. Any advice will be helpful.