Well, there are special foldable Bikes for military use, by paratroopers, but that ´s a little bit too much enthusiasm for me. As long as FSC Dädalus settled in Höxter, Germany, I always cycled there with all my gear. Even thoug skydivers are said to be crazy in any way, this affected headshaking here and there.
At the moment I have done 124 jumps from about 4000m of height.
“The only difference between me and a lunatic is, that I am no lunatic” ( Salvador Dali )