Before the Segway, one of the more popular inventions in eco-friendly personal transportation was the folding bicycle. But some people (read: designers) are just never satisfied. So designer Gosha Galitsky developed a concept for a "briefcase bike," according to Treehugger. The bike, when folded, can be toted along like a pullman suitcase. We can't wait to hear what airport security will think of this.