Exactly. If you're travelling so heavy you made a mistake somewhere unless you really know what you are doing, have the physical and mental attributes to pull it off and the circumstances are highly specific.

I just got back from a 3-day trip in the mountains with the temperature nearly freezing at night and all my gear together didn't weigh more than 15 kilos. That's with 3.5l of water, a big sleeping bag, poncho, LBE, hatchet, mess kit and plenty of food (I packed too much, again ). In warmer weather I would easily reduce that to not much over 10 kilos, mostly depending on how much water I'd need to carry. But a 40kg pack is a serious overkill.

BTW if you have to move a very heavy load (big game etc.) some distance a drag sled is a lot more effective if the terrain is not too rough.