April 19, 2009 There are more than 130 folding bike manufacturers and all of them produce bicycles designed as supplementary transport – designed to be carried in a vehicle for last mile transport, or on a train, plane, boat or bus as ground transport on arrival. Accordingly, most come with their own carry bag, but the latest prototype concept from Airnimal promises a new level of functionality. The concept involves the hard carry case doubling as a bike trailer with a significant carrying capacity. It's a perfect solution for the traveller … almost. We'd like to see another suitcase which clips onto the trailer so you can carry your other stuff.