For actually hunting a small bag is fine, I agree. I'm in California, not much hunting out here.
For a trail walk or range bag, larger would be needed. That is probably where I was going off the rails. A 50 shot day would require, 15 to 50 cleaning patches, 50 shooting patches, 50 Balls, powder, priming powder, Moose milk, powder, extra flints, flint leather, screwdriver, pick, short starter, maybe a patch knife, ball puller, and patch puller. That's a lot of stuff.
Perhaps I should make a historically sized bag for show and a big one for go. I have seen a guy use a carpenters tool belt. Worked very well.