There are some "extras" you can add to your notebook. Above you will see ribbon that has been taped into the book. That served as a bookmark. I had the students knot the end because ribbon tends to fray. I liked the bookmark. Another teacher I know had student put beads on the end of their bookmark.
I also glued an envelope to the back cover. I saw another teacher do that and she used it for loose leaf papers. I recently used mine to store the accordion card project while students were working on it.
The same teacher also glued envelopes (2) to the front cover and it stored things like homework and bathroom passes. I never used mine that I glued in the middle school so I didn't add it to my elementary school books.