Nobody carrying my suitcase either, and during my trekking in Nepal some 7 years ago I carried my 20kg rucksack myself although there were Nepalese carriers (I got a lot of sympathy from them!). I was (for once) travelling in a group. Usually I travel alone or with my partner.You just find a 20kg combo and lift that to chest height 20x each day, not all at once. Each week you add 2 kg until you reach 40kg.
Then you maintain.
Strength is but a skill.
Nobody carrying my suitcases upstairs when I travel in my 70s
And I am still playing "some" judo. My morphology isn't suited to heavy lifting, and I am getting older anyway.
But I understand what you say ...