Limiting yourself to a carry-on size bag and a daypack is good universal advice, but where the actual packing’s concerned, there’s no substitute for personal experience. If you lack experience, then self-knowledge, some research about where you’re traveling, and the size constraints of your bags will be better guides than the advice of others, IMO. The value in articles like this lies in, as Merlin says, “inducing a basic change to how you think about what you’ll need — and really use”. But the specifics of packing - nah.

Contrary to the advice of “experts”, I need two pairs of walking shoes (unless I’m in the tropics), wheels on my bag (sorry, Mr One Bag), I can’t wear synthetics, and I’ve never wished I had a Swiss Army knife with me. I never worry about wrinkles because any place where I need to look unwrinkled always offers access to an iron. And (sorry, Mr Flinn) I’ve been to more than one place where there’s not a chance in hell of buying toothpaste or a sweater.