What should you do with leftover RMB at the end of your trip?

Should I deposit directly into my bank account (Citibank)? Or should I exchange back to USD it at a currency changing place?|||I recommend keeping a bit for future usage. If there is a large sum left, keep about 200 RMB, and exchange the rest at a currency exchange during a time when the RMB is stronger (You'll get more bucks) and find a place where the charge for the exchange is low (if not free).|||I always exchange it back unless I am returning soon.