75% body wieght, for me that equates to nearly 95 pounds. and i can carry it. but then again i train every day with a 20 pound backpack(my EDC) and combat boots. also i live in a pretty flat area, so the main problem for me is clearing out to a suitable flood proof ground in a county with the lowest high point and lowest low point, takes some moving.
the things to take into acount are, 1 ground type, lighter loads for rougher ground, 2 weather, less kit needed in hotter climates, 3 how much can you carry, and not just round the garden, 4 BOV ie are you going out in a rover 25 or an army 7.5 ton truck? and also the ground its going out in(ie trucks and mountains don't mix) 7.5 ton trucks can take a lot of stuff, a rover 25 has a smaller boot than my bergen.