Okay. So the bag arrived today and it's great. My torso is just the right length for the belt to rest on my hips/waist for proper weight distribution with heavier loads.
The only problem is the yolk straps are resting on the trapezius superior muscle area and it's uncomfortable even with the bag empty. I thought that was only a problem with people who had a thick neck, but I don't have that. Now I'm left wondering if this is because the 72 isn't properly fit to me and I need something else, or if it's simply because I haven't worn any sort of backpack before, and I'm not used to straps running across that area.
How long of a break in period should I give myself to become accustomed to the pack being there, before I write it off as a bad investment, and try a different option?