Not sure if you are thinking about inlines or sidelocks but here is what I carry to keep my flintlocks working...

My loading block and powder measure are on a leather thong attached to the pouch's strap, which also has a thong for the powder horn...I also have a short starter, extra flints, balls, a roll of greased ticking, a few cleaning patches, a knapping hammer with built in turn screw, a frizzen cover and wing bone turkey call...