I do a lot of traveling/backpacking and keep cash in three places: Wallet which is in my pocket or the top of my bag depending how near to civilization I am. Vacuum packed and hidden in one of my orthopedic insoles. And the third bunch in a small plastic bag inside my diary with my other SIM card and a seldom used debit card (Sweden is moving towards cashless and some places don’t take cash, the horror).
I don’t like to have less than 500$ (around 4,000SEK) on hand but need to stock up on small bills, just having 100, 200 and 500kr bills isn’t much use.