Isn't your suitcase a hindrance when you're not using it? If it's a suitcase that becomes a shelf, it's storage that you usually show as a shelf! Remove the casters and carry it on board MAX size. It doesn't even stain the floor of the room! It doesn't roll on its own! Easy to replace! Even if you are on the go, it will be a shelf as it is, so it does not take up floor space, you can use it immediately, and you can leave immediately!