Jasin wrote on Jan 27
th, 2024 at 5:02pm:
Dude!

Sherpa can carry a lot more and Yaks even more.
You obviously haven't a clue on what it is really like 'up there'.
You probably don't even know what its like when you dip in elevation or where exactly it really is hard to suck it in - even with just a camera bag on.
I weigh 105kg. I carry around a ruckpack loaded with 35kg worth of bricks and slabs of concrete. That is pretty hard going for anyone physically fit. For me, it becomes a bit of a challenge. Having stayed at my sister's place, which is 650 metres above sea level, you can notice the slight difference in atmosphere. Still very manageable. But I bet there would be more likely to be middle-distance and long-distance runners coming from there, rather than those that are from sea-level regions.
The higher you go, the thinner becomes the air. 3,800 metres above sea level would make it somewhat more difficult to breathe. But, by no means impossible. The difficulty is being able to carry around 40kg of equipment/supplies in a mountainous region for very long.
I am not about to add 5kg to my ruckpack just yet, just to see what it is like to carry around 40kg. I struggle for a while putting on a 35kg ruckpack. But, I would imagine anyone weighing under 100kg and not physically strong would struggle to walk very far or make good pace with that amount of weight to carry or the ability to breathe at such an altitude.