Just a bag that weighs 1 stone no matter what's inside of it. I don't know if that would be helpful in some exploit or another (if so ignore the idea) but it would be amazingly helpful for moving stuff from house to house, or house to bank, or even floor to floor inside the house.
I can't be alone in being annoying by moving a lot of heavy stuff, bit by bit.
I can't be alone in being annoying by moving a lot of heavy stuff, bit by bit.