What will be good currency?

My husband has been bugging me for months to go through the boxes of stuff we have accumulated and sell it on eBay. I have been to lazy really (out of sight out of mind.) The other day I told him that if the financial markets continue in this direction and we end up in another great depression our “stuff” could be our currency. We then went on to discuss what would be good currency to have in a collapsed economy. He says whiskey and guns. What other things would be good currency?