The German engineer Karsten Bettin has constructed a bike, called Kwiggle, that can be folded up and put under a subway seat, car trunk, airplane overhead compartment or into a 55 by 40 by 25 centimeter bag. The bike can be folded in 10 seconds. It weighs about 19 pounds and speeds up to nearly 20 miles per hour. It is not only very handy but it also supports the mobility of the back and prevents tension in the shoulder and neck.
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