Alan, I don't want to compare stream diameter, length of arc, PSI, volume per unit time, or color but whether a long range recon patrol team member's gear would outweigh a knights armor and weapons depends on what knight or more precisely what era of time and which knights. Toward the end of the epoch of armored knights it is very unlikely the modern man carries more as I wasn't kidding about the block and tackle/crane to get them atop their horses. They didn't ride ponies then but steeds on the order of Clydesdale's because of the weight.
The most I ever humped for an extended time (7-10 days) was a tad over 68 lbs (gross wt of pack.) That was more than enough for me above 6,000 ft. I tried to keep it below (hopefully significantly below) 50 lbs when going above 10,000 ft. When the lower altitudes of a hump are passes above 10,000 ft I need a turbo way more than a diesel, I just run out of umph. It helps to be at altitude for a while before having to do much physically so you can acclimatize, or so they tell me, I never had that luxury.
I did work with a guy who was part of a medical study. He was born and raised at Leadville, Colorado which is over 10,000 ft and his lung development and cardio-vascular development around his pulmonary system was unusual to say the least. When he was jogging a few miles he had more reserve breath left than flatlanders walking. He was a naval officer though and didn't do backpacks, he rode around at sea level in big grey things (AKA targets to my submariner friends.)
Pat