Actually, I'm past the point where I'm trying to find that great-fitting pack. I've narrowed it down to two: the Deuter ACT Zero 60+10, and the Granite Gear Escape AC 60. There's not a huge difference between them, and both fit me very well. Both are comfortable, and I just need to use each a few times to see which becomes my "go-to" pack. Right now, the Granite Gear holds a slight edge, but the Deuter is a quarter pound lighter and, with an extra inch of torso adjustability, perhaps a better fit.

The thing that prompted this post was the fact that both are rated to 40+ pounds, and you may be able to use them with a load that heavy, but I'm not sure either one would be very comfortable. Thus the question about the accuracy, or lack thereof, for the rating.