I ordered a box of 50 slide-grip report covers for a project I was working on and really like how simple it was to use them. The letter size report covers come with the slide on side closure that holds 20 sheets of paper. Using this method allowed me easy access to my work if I needed to change out a page. The front and back covers are clear and when the project was completed it looked professional and I was able to mail them out at a bettering shipping rate than what I would have been charge if I used binders.