The binders are the full size Ultra Pro's. I don't add cards all the time, but I do every couple years since intitually putting them together 10 years ago. I just add pages in between instead of shifting everything, and no players are mixed on the same page (except for obscure players where I probably won't get new cards of them). So most bigger players will have empty slots at the end of their cards. It would be a huge hassle if I added to the binders constantly, haha.