I built my shooting bag over a decade ago to use with whatever flinter I wanted to shoot. Having now sold off all flint rifles I'm committed solely to flint smoothbores that are 20ga, 16ga (my fave), and a .69 Charlie musket for reenactments (along with a proper haversack, bayonet frog, and cartridge box) - the bag works well for all those guns and any more I'd care to add.
On the bag strap is a turn key knapper (custom made out of special steel and I wish I could remember who made it for me a decade or so ago as I'd like a few more ti's that good!) and a fixed powder measure commensurate with the gun used. On the bag itself is a fixed sheath containing a Green River blade with red oak scales that I brass riveted on along with the working end of a jag as a handy ball pusher, a leather cylinder pouch for cleaning patches, and a bit of cotton cleaning cloth on a cotton string. Appropriate for the gun I'm toting, inside the bag is a leather pouch for balls, rolls of patch strips that are pre-lubed with Gato Feo #1, leather flint wallet, leather accoutrements pouch containing a jag, ball worm, extra touch hole pick, and a brass adjustable powder measure. All my long guns will have a leather thong knotted to the trigger guard and contain a touch hole pick and most also have a small brass pan brush.
Aside from the bag, I also made the powder horn that's always loaded with Swiss 1-1/2F for both tube and pan. Sometimes I'll also carry a ball board "speed loader" for woods walks.





