New Unaweep owner here. I'm 6'3", and ordered the 4" extensions on the buils spec. That seemed pretty good, but after the first day on the hill I did some minor adjustments. I cut 1" off the extensions, for a 27" frame, and made a good 45-degree on the lifters, and changed the belt grommet to bring the belt a bit higher on my hip bones.
Overall, I really REALLY like this pack. My baseline has always been the ALICE and ILBE packs. This Unaweep is like night and day for comfort weight, and adjustability.
A couple pics in the yard, and on the hill, these were prior to the fine-tuning.
Shane