HUH? I'm genuinely curious, not trying to call you out but as the host of the ILBE group buy I've got a little experience with them. I literally mean a little, because I'm not former military but I've hiked with mine several times and thoroughly inspected, reassembled, and studied about 500 of these. They seemed to be designed to accommodate MANY back and anatomy variations.
I've since deleted all the saved links to "how to fit and size" the main pack but it can be Googled easily. Off the top of my head the two big "fitting"/non field adjustments are the shoulder strap height position can be adjusted by repositioning the plastic plate in the velcro, the two metal internal frame supports can be contoured to fit your spinal curves...then there are the myriad of webbing adjustments that can be e while you are wearing it. I've only owned one commercial pack that was more customizable to fit the anatomy of the user, and it was a VERY expensive commercial version of the ILBE's that is not as good as my ILBE's.
Yeah I had forgotten about the covered velcro adjustment for the shoulders. I will say that my 6'4" father had some definite trouble getting it to fit, and that my deuter commercial pack at less than 4lbs was far more comfortable even with a 30lb load.
Yeah, so, wrong on the adjustment, poor memory moment. So don't listen to me there, OP, but.. I still did not like the pack - two loops around my local park was enough.
I think part of the problem is that you're comparing apples to oranges. The ILBE - as well as the Army load carrying system - is designed for infantrymen to carry large heavy loads (typically 100+ pounds) while what you seem to be looking for is a strictly lightweight load-bearing pack. Both systems are constructed for optimal load-carrying of their projected loads. I like the idea of the ILBE because it gives me the option of carrying bulky or awkward loads while still being able to get at them easily. It also gives me a certain flexibility in load-planning. For instance, I could load my "gotta have" emergency supplies in the assault pack and the rest of my stuff in the main pack, and still carry both of them. If that sort of flexibility doesn't fit your needs, the ILBE system may not be for you. On the other hand, if you can't afford $350 or more for a quality civilian expedition pack, a surplus ILBE system or the Army system might be right for you.
I think part of the problem is that you're comparing apples to oranges. The ILBE - as well as the Army load carrying system - is designed for infantrymen to carry large heavy loads (typically 100+ pounds) while what you seem to be looking for is a strictly lightweight load-bearing pack. Both systems are constructed for optimal load-carrying of their projected loads. I like the idea of the ILBE because it gives me the option of carrying bulky or awkward loads while still being able to get at them easily. It also gives me a certain flexibility in load-planning. For instance, I could load my "gotta have" emergency supplies in the assault pack and the rest of my stuff in the main pack, and still carry both of them. If that sort of flexibility doesn't fit your needs, the ILBE system may not be for you. On the other hand, if you can't afford $350 or more for a quality civilian expedition pack, a surplus ILBE system or the Army system might be right for you.
I use the assault pack every day to carry my inspection gear in a refinery/powerplant/mill situation. It can take massive use and come through unscathed for the most part, but, again, there are lighter and more comfortable options for sure.
I would think carrying over 50lbs would take some significant training and practice.