I usually organize it by album version! Since most groups have albums that come with at least two pc sets, the top could be both of one idol's pcs from that version while the bottom is the other's. Or you could do half and half with the binder and organize it by photoshoot/outfit!
Hi, tysm for the suggestion! Currently, my binder has pages of 9 pockets, mixing by photoshoot/outfit is a great idea for these pockets that are left over