I love this idea, but I have five class lists. I still wanted to do this, but I had to think about how. This is what I came up with. I bought three badge holders. I created the small lists like above. I put my homeroom on the back of my badge and put the other four lists in the other two badge holders. Two lists per badge holder, with each list facing the opposite direction.
Does anyone have any other ideas about how to carry around your lists with you easily?