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concept folding bikes

Although folding bicycles have seen somewhat of a renaissance, there has not been as much innovation compared to mountain bikes, because the market is smaller.

This is a shame since although there are some great products such as Bromptons or the Birdy, there is, in our opinion, no ideal foldup.

An ideal foldup would be one that folds so small and is so light, that you could take it in a backpack, just in case, like carrying an umbrella in case it rains.

A couple of the concept designs here come close - vote for your fave.

 
(Ranked by user votes) Vote on and review the contenders below.
The best, most compact design mockup we have seen.
In addition to being a foldup, the drive mechanism is hydraulic, for ease of maintenance.
Aconcept bike by Josef Cadek LOCUST bike
The ON is an urban folding bike design that follows on from the hydraulic powered Jacknife, concept.
A student project at the University of Derby, england
Only a ketch at this stage, but an interesting design - albeit for a very niche market!
winner of a Merit Prize in the 2006 International Bike Design Competition.
It looks like the suitcase bike will actually go into production and cost around $400.
Designed by Gosha Galitsky
An electric folding bike concept by Bosonworks.