In reply to JPE:
> The position, cut, angulation and padding of the straps and waist belt are subtly different on female packs due to anatomical differences. Not different enough you'd notice with a light pack, but it is noticeable with a heavy pack over a number of days.
I regularly carry heavy packs over a number of days and I don't find a difference. For me it's all about adjusting it so that the weight isn't on my shoulders.
> Also, generalising, women are shorter so a women's m-l may be the same as a men's s-m. Adjustable back lengths plus a proper fitting are the way to go.
As above, I don't want it on my shoulders, so longer back length and good adjustment works best for me.
> Edit: the thing that is hard with teenagers is that they're often as tall as adults but haven't developed the breadth across the shoulders to comfortably accommodate adult packs, from my experience.
Yes, a good chest strap is key on this point.
The daughter needs to try lots on with weight in them and with different adjustments and see what works for her as we are all different. I guess I didn't make my point clearly, as I was very tired when I wrote that, but I was trying to point out that female fit is not essential, just one of many options. All should be tried, don't limit the options to female only.