I love the idea of these very affordable, modular cubes.  They fit perfect stacked 2 high in my sons room under his window.  He uses them for his books and binders and they seem to hold up ok.  The only thing I think buyers should know is that they are not super sturdy.  They are held together by adhesive and if they are bumped on the side or leaned against they can fall apart easily.  When they are assembled correctly they can hold a significant amount of weight but if you grab one to move them they can come apart.