Seconding TopDeck! Some zipper binders tend to distort/squish the pages when full, but there’s enough room between the spine and the start of the pockets where it hasn’t done that for me, even when super full. There’s also a good amount of leeway in the zipper so they can still properly zip with filled pages.
I have their 9-pocket and their 16-pocket in blue, and I’ve loved them. They’re a little expensive, but not too bad if you get them on sale.