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Backpacks are incorrectly designed to begin with, heavy weight is supposed to be high up, this is packing 101.
Internal frame backpacks are specialist items developed for climbing and mobility, therefore lowering the center of gravity for stability when leaning forward.
Before backpacks became fashion for trail hikers larping as mountaineers, external frames placed the heavy items high up, often even leaving the bottom space empty so you can attach a sleeping pad.
One only have to study primitive cultures to see people carry heavy loads towering above them. Or even balancing things on their head so they have the point of gravity above the body.
