Whats the difference between O ring and D ring binders?
D ring binders allow pages to lie flatter and you can also fit more pages. With the straight side, the pages are kept in line. O ring binders are fine for paper, but if you’ve got valuable items stored in binders, such as trading cards contained in archival plastic sheets, you must use D ring. You can get away with an O ring if you don’t have more than ten to twenty pages. Beyond that, the circular ring causes the bottom most pages to curl upward nearest the ring under the weight, and items get bent.
