Undoubtedly, the person who can best answer this question is John Ninomiya, an American hot air balloon pilot and father of cluster ballooning, a kind of sport that consists of getting off the ground using balloons inflated with helium attached to a harness similar to the one used by paratroopers.
Ninomiya has made 32 flights in this way and has reached the record height of 6,500 meters. To get off the ground, you need to fill 40-120 latex balloons with 226 cubic meters of helium. This volume is necessary to lift his 80 kilos of weight plus 80 kilos of ballast and 54 kilos of instruments to stay in heaven.
