I have used the 8½x11 binders for some items in protective sleeves.Due to thick cover, they can stand upright without bookends. They come with 5 quality sleeves. I also got a 12x12 binder as a test. It can handle full size US sheets including refills from Scott.
I actually found a reference to these in a different thread. I ordered a couple samples that seemed inexpensive, only to find a pretty nice deal. Only brown and marked "on sale", but after watching for 3-4 weeks, THIS is a deal. I've already ordered my fill ... more than I would have, but the prices are good. $8.88 each with free shipping over $60 (10-11 otherwise). These are the 12x12 big binders only.