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I have a relatively cheap Mil-tec rucksack similar to the one abow. It can easily handle 30 kilos (66 pounds), will test 35 kilos soon.
A Danish elite soldier is expected to walk at least 50 kilometers (31 miles) with at least 35 kilos (77 pounds) with in 10 hours.
Me walking a hour with similar weights, should be a modest goal.
I suggest building up in wave form, 1-3 times a week.
It could look like this:
30 min. with 10 kg
30 min. with 15 kg
30 min. with 20 kg
45 min. with 10 kg
45 min. with 15 kg
45 min. with 20 kg
60 min. with 10 kg
60 min. with 15 kg
60 min. with 20 kg
Soon you will be walking 60 min. with 30 kg.
Note: the Canadian only walk with 10 kg in their backpacks.
Romanian wrote a comment:
“Make sure to stretch on a bar after walking with a heavy bag! My spine was compressed by a few good centimeters after”
That sounds like a good idea. I also do Pullups with weight in the bag.