I made a sack to go over the back of one of my student's desk chair so her desk wouldn't be so crowded and she could find her books easier. When she pulled a book out of her desk lots of stuff didn't fall on the floor. Of course she couldn't put lots of books in it because the weight would make the chair fall over. However, for crayons, pencils, etc. or a few spirals or folders, it was great.