I used this unit on the floor as a bookcase to hold my large collection of books. It took up less floor space than a standard book case, will keep the dust off my books,[I hate dusting] and looks great.  The cases hold standard size and paperback books easily. I used several units to create a wall of books under my windows, which also gave me a nice display shelf as a bonus. I love the ease of installing the doors and how nice they slide open or closed.
Kay.