My cousin designed and built a prototype of a folding trike that fit in a suitcase. He'd check it on a trip, and on arrival unfold it. Then mount its case on th

My cousin designed and built a prototype of a folding trike that fit in a suitcase. He'd check it on a trip, and on arrival unfold it. Then mount its case on the back and put his normal suitcase in that. He could then tour around whereever independently with his luggage. Had a blast touring Costa Rica he said.