I saw Will James riding one on the north shore of Oahu a couple of weeks ago. I asked him what was the basic idea behind them. He said that they basically allow you to go really fast across the water. I suppose there's the obvious really low swing weight for jumping. I would say that it was about 3 feet long. Not sure what that is in cm, but I'm sure you guys get the picture. I guess that could really make it great for traveling. It could probably qualify as "carry on!"