One of the first classes I took years ago, the teacher gave it as a tip. She kept all her course materials/notes/samples in each box, stacked and labelled the ends for a quick prep each time.
Instead of leaving them as is ... I cover them with adhesive plastic, and put a long shoelace thru as a tie.
Makes it a little more durable, plus of course, prettier!
Works perfect to take WIP for Show & Tell or to audition extra fabrics at the LQS.