People who are looking into folding scooters might want to check out http://www.stowboard.net. The Stowboard has been categorized as a folding skateboard, but it’s low center of gravity, smooth ride, and radical wheels make it more like a folding scooter without a handle. And it folds up to about 11 inches for easy stowing in a backpack or locker. I use mine with public transportation. I have a friend who skates around airports on his when he flies.