This is an excellent primer on how different pulley set-ups work.

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I use a 3 pulley set-up, so a 90# foodpack would take 30# of force to lift, which even the smallest person can generate if they simply grab end of rope and walk away with it like in video.

Small self-lubricating sailing pulleys are fairly cheap and once you use them, you'll never strain with a 1:1 set-up again. ;)