Our group of 10 just finished 12 days at Philmont, over 75 miles, lots of vertical, and two of us with new ULA Catalyst packs. We were both pretty happy with them. There are several changes we both agreed would help, and we're working on a review for that.
You may also want to look at the 3 lb Coleman external pack frame. How they got it so light is a mystery to me. It's bigger than the Catalyst, cost much less, has a lot of places for attach points, weighs a few ounces less than my Catalyst, and rode very well on one of our trekers.