There really isn't and that worries me as well now that the 10% limit on cash on hand is no longer. You're covered to $250K per depositor...that is it...
You can take it out and put it in your mattress if that makes you feel better. If you think of anything, let me know
With the FDIC working: Seems like as long as the GOV is working you should have no problems.
With the FDIC not working: There's other things that will be more "valuable" than greenbacks.