Once upon a time, I got a 2 piece toolbox with wheels and folding handle. Figgered to put ALL my shooting stuff into it to have everything on hand. Trouble is, I usually didn't need EVERYTHING for most range trips.
Over the years I accumulated a bunch of nylon canvas lunch bags with zipper tops. They're just the right size to load up with range stuff. I've got one for cap & ball revolvers; one for percussion rifle; one for flint rifle, and another for smoothbore. In addition I've got bag & horn combos for a couple of rifles.
And then there's bags for modern revolver, pistol and rifles ...