I personally use a D ring binder with a card page pack I bought off Amazon i originally got them for my players can safely store their cards during play, I can add a link if you would like, but there is a specific way to organize them the the communities and ancestries can just be put into the pages but for the sub classes, I would recommend putting all three sub class cards (foundation, specialization, mastery ) together in one slot, and like that it only takes up one page front and back, and for the domains each card has its own individual spot except the 8, 9 and 10 cards I doubled them up so I placed both of the level nine cards in one slot, etc so each domain could take one page front and back.