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Josh K.depends on the size of the binder. I use the collector series binders from mj roop, which use 3" D rings, and I can put 9 pages of 4 (36 cards) in each. You could probably fit a 10th sheet (40 cards) but it would be right to the top of the binder and may put a little stress on the top sheet. Its not a ton, but its better than the hard plastic pages for psa/gai/bgs cards that Bob mentioned - you can only fit 4 or 5 of them in a binder.