When much younger, I carried rucks that averaged 60 lbs - I was the Radio guy for the Commander. 30 lbs of radio/5 lbs of extra battery/25 lbs of gear. This is not counting the stuff I was wearing.

In Alaska my ruck went just over 110 - and I was tethered to it by a battery cable that ran from under my shirt (battery was strapped to my chest) and into the ruck where the radio was. So not fun.

There is no way on God's green earth I would want to try to hump a 100+ lb pack. That is why they invented caches.