> the more you travel, the longer you live, the more you discover things that you didn't need

Thing is, you don’t know what you need until you’ve done this. I have taken a two-week trip out of a carry-on suitcase. You will need laundry service at some point if you want to be presentable in public, but there are companies selling clothes that are designed to wash and dry quickly even with hand soap and a sink, but you have to know they exist and be able to afford a not-cheap new set of clothing.

But I have done this because I started minimalism with trips to places where I knew I could buy whatever I needed within an hour if I forgot something. Do several of those and notice what you don’t use, pulling it off the list unless it’s a rarely-used-and-important-but-not-replaceable-quickly item. Like my contact lenses, which are always a special order. I keep a few in every item of luggage I own. I carry a spare phone, because if my phone dies outside the US or Canada (as my Nexus 6P did) it’s not trivial to get a replacement with US frequencies, and with eSIMs not trivial to swap into something new while still being on my US number (needed for work). I would have to find WiFi first.

And yes, my backup phone has the apps for my service and my wife’s. As soon as I have WiFi, I can be going in ten minutes. It’s currently running a backup of my phone that I update before every trip, but I back hers up too, and while it might take an hour or two to restore and get working again, it can be done easily.