I saw a thread recently asking how much money you carry in your wallet, but I think the more interesting question is how many different currencies. At the moment, I am carrying six: US$, Japanese yen, Chinese yuan, Hong Kong dollar, Singapore dollar, and Euro. I probably also have a few Indonesian coins floating around on me from a previous side trip to Bali. The total amount in cash is more than I would prefer, but I don't like to arrive somewhere without enough cash for a taxi to my hotel and walking around money until the next business day. I also don't like to change money back ever, certainly not unless I am confident that I will not be returning to that country for at least several years.