I'm using these http://www.ebay.com/itm/262062018808 for quite a while (got the second one in 5 years, as their locking mechanism goes bad eventually). Great for chip cards, as it works as a Faraday cage for them. Fits some bills as well. All the change I'm carrying is 4 quarters, just for a coin phone, I guess, along with 5x$20s in a secret emergency stash.

(you may want to search there for the model with ribs on one side, it's sturdier)