If you're an avid traveller, then this is the perfect idea for you. I usually keep all my notes and coins in the same pouch. Albeit organised, but still cumbersome when I have to pick out the right currency when I'm beckoned to travel. I keep the Japanese Yen in a separate wallet altogether to save trouble, but the rest was just... :S urgh, especially when it's difficult to differentiate between Cambodian and Thai coins :P
So, here you go. I'm reusing the 'ang pow' packets from last Chinese New Year to categorise them into countries. The packets are deep enough to also keep coins, so there you go :) No more picking the wrong notes and getting stranded in a foreign land!
*tada*