This Product Ships Free. The Cubi Bookcase, now with adjustable shelves. Welcome to the next level of cube storage organization. Now you can adjust the shelf height within the compact modular Cubi bookcase size that works so well in small spaces. This adjustable Cubi has two removable shelves and offers five different shelf positions, so you can customize the shelf height to your needs. Best of all, these adjustable Cubi bookcases work perfectly with the original Cubis, so you can build on your existing configuration. Of course, the optional  fit, too, and you can even add more