u/Bildukas5

ORTLIEB Micro-Bag is a nice little saddle bag, but due to it's construction it is hard to store items in orderly fashion.
I'm linking simple organizer that allows me to store CYCPLUS Ultra pump, TPU tube, tire levers, set of HEX keys, TORX key, spare derailleur hanger, set of tube patches, short USB cable, spare chain link, Shimano Di2 charging adapter and still have some room to spare.

https://makerworld.com/en/models/2752144-ortlieb-micro-bag-saddle-bag-organizer#profileId-3053689

Please keep in mind that HEX key holder was intentionally made bit tight, so you'll have to manually break it in by forcing short end of the key into the slot and wiggling/rotating it until it feels reasonably loose.