1) No gluing: I have punched pockets for some time now and they are in my closet under a pile of paper stocks. The Sheet protectors can still very well separated
2) Easy to open: the One Sheet protectors can easily open "flicking" by. No blow or eternal twirl
3) Many edge-holes for filing: This has the advantage that I can use the Sheet protectors not only for files but also for folders with 2- to 4-Abheft chopsticks