I used them to preserve reading fact sheets and put them together to make up informational booklets. This way the students can use them repeatedly and I don't have to worry about the wear and tear.
I used the sheet protectors to preserve various reference books I put together for my third grade class. Each booklet is fact based and related to stories they will be reading throughout the year. With the protector sheets the pages won't get destroyed and I will be able to keep these books for years to come.