This may be a bit of a rant, but binders are horrible. Since binders have a ring on one side, when it is half-full and put into a bookshelf, it will cause the back end of the bookshelf to have more space than the front end, so things will become unorganized. On many binders there is also the problem that the rings are not attached on the outside end but rather on one of the two large sides, making it much more difficult to stack papers. The ring should also have a flat edge so that papers can be laid out evenly. Not every binder has the same thickness of walls or the width between rings.