When I was much younger and going to be a bit too far from home for comfort or be in some unknown place, I used to always try to run around with a currency note in my shoe and/or sock, and it usually would be something equivalent to 5-20 hours of the wage for the average local McDonald's worker. Same thing if I went away to camp. While I no longer do that, the habit of wanting cash along with me most times has obviously not ended based on what I'm carrying with me today.

I am walking around with a collection of the following valid currency notes: USD, EUR, GBP, CAD, SFR, NOK, DKK, SEK, MXN, INR, ARS, BRL, CNY, THB, NZD, SGD.
I am walking around with a collection of the coins for the following: USD, EUR, GBP, SFR, NOK, DKK, SEK and CAD.

I also have some Belgian Franc, NOK and SEK notes that have been sort of demonetized. For those, I have to get the central banks to exchange them for spendable currency, but I'm holding off on doing that exchange with the old SEK notes until my collection of them is far more substantial.

Everything else I try to get rid of and run down before I leave the country of issuance. Surprised I have no AUD and JPY left.