Amazon keeps sending me the wrong thickness binder--three times now! Now I use this and other Avery color-coded red *heavy duty* binders to store my multiple, large-size rounds (coins) collections of different sizes The rounds are stored inside the binders using thick, archival, acid-free, three hole punched, heavy duty pvc coin sleeve slot/holders. I also place a 24 lb, acid free backing board (inside 3-mil thick, 8.5" x 11" magazine backer sleeve), behind each coin sleeve, for flat storage stability. The combined rounds in their inserts can be heavy, but these sturdy binders do the job nicely to hold them all for easy access when stored on multiple bookshelves. Use only binders with the "D" rings, not those equipped with the cheaper (and less sturdy) round type rings. Important: "D-rings hold the coin sleeves flat without them riding up on each other when the binder is closed.