Ranger,Pack design and loading of gear will greatly influence individual capacity.The rule of thumb is heavier items towards the top. I've found in the real world that my natural balance suffers exponentially and what I need NOW is toward the bottom! A stout walking staff is a great help,and makes a great defensive tool,impromptu tent stake to name a few uses.I've heard everything from 1/4 to 1/3 as average capacity.Personally I feel like a astronaut with some of these packs on.I like a smaller rucksack with an Aussie type swag over one shoulder and a canteen opposite.<br><br>