If there's a handle you can hook into, anyone can carry ~20kg with a single finger (index or middle finger). For me, the limiting factor would be the handle biting into my finger too hard, but I can likely go up to 40kgs.
20kg is about the weight of a bag of water softener salt. No way am I carrying that from one finger for more than about 10 feet exactly because of the limiting factor you mention.
