A pen. Everything else could be bought at the destination, but a pen. The horror and anger to oneself, when you are given a landing card, see the queue at immigration, and you don't have a pen for the card in your hand.
Another thing I like to pack is a plug in night light for bathroom.
Get a password app subscription (paid)A backup password protected USB stick with all my passwords and contacts list, which I always keep separate from my main luggage
Get a password app subscription (paid)
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"What's in your backpack?" ..Zip lock bag with qty toilet paper (don't travel in Indonesia without it!).
I'm using the free version of LastPass across multiple devices and found it Ok so far.
Genuinely interested to know your thoughts on pros/cons etc.