Abstract: Disclosed herein is a container suitably fashioned to serve as a book shelf which is easily stackable and transportable including a six walled container provided with a front wall slidably disposed on said container, a back wall, and a groove running adjacent the back wall along end walls and the bottom wall thereof so that when the container is to be used as a book shelf, the front wall is placed in the groove approximate to the back wall, and when the book shelf is to be used as a container for transporting the books, the front wall is disposed in grooves approximate to a front area of the container so as to contain objects therewithin. Further, these plural containers are provided with interlocking devices for securely interlinking plural such containers.