So.... they are suitcases within suit cases, I guess. I know I'm not the brightest bulb on the tree, but, I am having a hard time understanding why I would want to do all that extra work of packing and then repacking. What is achieved by doing that. I must be missing something or my lazy gene is just blocking out the reasoning behind it. Especially in this world of airport security, I would think that the original purpose would be completely destroyed during a bag check.
When I was a kid he used to have a guest called the Banana Man who would come out and take boxes out of boxes and make a train and then take items like big bunches of bananas, and other things out of his pockets and fill the train up all the while saying "WOW" over and over again. The cubes are exactly what reminded me of that.