Wow, that's a lot of weight. 18kg?! I don't think I can move normally with that.9kg is a very heavy load. During my firefighter training period we had to run and do exercises with a full compressed air tank which ranged in weight from ~8 to max 18 kg depending on whether it was carbon or steel. Running with weights is hell and probably not so good for the joints to be honest. Still, kudos.