All I can say is that I love it! I have used it to pack moose and elk out of tough thick and hilly country with ease. It made a tough chore a lot less torturous
I also used it on a short 3 night sheep hunt and found it excellent! I am sure internal packs are lighter but I wouldn't go back to one. I did not find it heavy at all or really noticed what its wieght was, it just felt good! I always have a partner to split packing stuff so I don't need 90L pack which you might if you are a solo hunter.
Anyway my 2 cents, After 30+ yrs of hunting it ranks up there with my meindl (sp?) boots and my leatherman, as an excellent buy and functional tool which makes hunting a little more enjoyable.