What’s a must-buy item you get when traveling internationally?

I have to travel internationally soon, and I’ve been making a list of things I simply cannot get here: right now it’s benadryl and maple syrup. Last time peanut butter was on the list, but it’s since become a gym-bro food and is much more accessible. But the thought occurred to me others must have their own lists.

So what’s something you can only buy when in another country that you make sure to pick up?