A small stash of pre-1965 (= pure coin silver) dimes and quarters might be prudent "just in case". Those will work to facilitate trades for food etc. in the case of hyperinflation or other economic catastrophes.

sometimes you can pick up silver dollars and half dollars at not too much of a premium over bullion. these are practically worn out, of very little value to any self respecting collector. i assume if the us experiences hyperinflation, they will still be legal tender of the liquid variety, after all they were minted by the us govt (for what that is worth).