Looks like NTAG213 are the smallest you can get. Too big to fit on the SD, but could probably fit on whatever organizer you've got.
Discussion
My organizer has numbers on it. I'm going to use those numbers and put notes in my obsidian stealing nostr:nprofile1qqs02k3xd5vd97g0acf2235xemkzsxnwr8ppwgd9d9jdz6mwc5ad4ncpr9mhxue69uhhyetvv9ujuumwdae8gtnnda3kjctv9u03at8g idea.