This is one of the most useful hacks I ever encountered. These organisers are meant to be used in handhabgs to keep small things sorted. You can get them really cheap and in different makes.
Some already fit perfectly into a doctor’s bag, and more can be used in one bag. They will hold the small things like thumb tips, bills, cards, and all the other small crap magicians have to carry around, perfectly sorted.
Search for “bag and purse organizer”. A quick and working hack.