Carrying a load on your back and walking over distance is a deceptively difficult skill ... it seems easy at first but gets heavy pretty quickly.
I remember when i was in 7th or 8th grade, my best friend, a "city kid" from the thriving metropolis of Montgomery IN (population of a few hundred folks) was helping me with my chores on the farm after school, so we could start getting into trouble sooner, I suppose...
I had yet to hit the growth spurt that would lead me to the strapping 5' 7" frame I now boast.
So I was probably 5' 0", 100 lbs, but solid like that hick'ry stump o'er yonder in tha holler by tha crick?
Chris was a sports guy, already 5' 6" 140 lbs easy.
So there were some sows farrowing out in the second woods and I would daily carry the feed on my back and hike over hill and dale to feed 'em. I split the feed up, giving a moderate portion to Chris and leaving the rest to myself. He thought it was a joke, insisted he take at least half. I smiled, divvied up his half, and commenced to hikin'.
I easily carried my half to the destination, dropped it off, turned around and hiked back to where Chris had given up (not even half way there), took his half and finished up the job.
I recall in my high school days, easily walking distance with two 50 lb bags of feed one on top of the other.
Nowadays, we get the 3 gallon bottles of water delivered because lifting the 5 gallon bottles are tough on my herniated disk.
Because of the logistics of the disk, I can barely carry a full basket of laundry out in front of my body, but I can carry a reasonable amount in my backpack, or lift furniture with my back to it. Weight out in front torques the disk the wrong way. Ugh.