I have used Felice inserts since buying my Damier Ebene Favorite MM over a year ago. They are perfect: one holds all my cards, plus cash in the center slot (no need to fold!). The other pouch holds thin, long items: stylus, 6 inch iphone charge cord, and a few more cards, etc. i love that these inserts are long; they run the length of the bag & still allow my iphone plus to fit in nicely. Try
Fashionphile; that is where i bought mine. Also: got a great organizer off
Amazon, not bulky and gives great form to the bag: no slouching, no bulges, etc. I thought getting an organizer for a Fav MM was absurd, until i watched a YT video on it. ♀️