I'm sure we all have this issue. We change money to go overseas. Then we spend and by the end of the trip, we have a little of the currency left, or maybe even a lot left. I usually manage to bring it down to under S$100 worth. Then I come home and keep it in an envelope and I think to myself, "I'll use it again the next time I go." Sounds familiar? I usually don't change the excess back to Singapore dollars. So I have a drawer with many different currencies. A bit of Thai baht, some Pounds, some Euros, a bunch of Indonesian rupiah, HK dollars, Taiwan dollars, Chinese yuan... Etc. Ok I go to Taiwan often so it's valid that I keep TWD for my next trip. However, I doubt I will go back to the UK anytime soon, or HK or Indonesia or Thailand, etc. these countries I ......