I took a ledger with all my savings to date with me from the US to Bangkok years ago (2013) when there wasn't a Thai bitcoin scene yet. No lightning network either, but on-chain spending was instant still.

I just kept it in my pocket, so TSA likely thought it was a USB drive. I knew that if they stole it, the PW would protect those coins and I'd always have my seed phrase backed up at home.

I looked for places to spend it there but didn't get a chance except for a cell phone minutes refill, which I did online and worked instantly. I think I spent like half a bitcoin on that, lol... But it wasn't expensive at the time.

Today I have a totally different security set up and would never travel with that much of my portfolio, unless I'm fleeing this country like we'll all have to do if the commies win in november...