One piece (dewey) rods.
Bore Snakes for shotguns, I don't think they work very well on rifles.
Brass brushes for every caliber.
Powder solvent, copper solvent, lead solvent.
Regular oil in a bottle, light spray oil, brake cleaner.
pre cut patches (because I'm lazy)
Cloth baby diaper to lay parts and cleaning tools on.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.