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Anon invents a new way to travel
(sh.itjust.works)
This is a place to share greentexts and witness the confounding life of Anon. If you're new to the Greentext community, think of it as a sort of zoo with Anon as the main attraction.
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Balloons go to 12 miles all the time, they stay at whatever altitude they are neutrally buoyant at. The OP says hot air balloons, but if you ignore that requirement you can get a non propulsed balloon to 30 miles up. It doesn't just pop, it does leak slowly bc no bag is perfect.
https://www.isas.jaxa.jp/j/topics/topics/2013/0920.shtml