To start with: 8 items you never pack...but should
I love a good adventure story, especially the kind where someone has to use their ingenuity and whatever they have on hand to survive or outwit their antagonist. In my current manuscript one of my characters is taken from her world and whatever she happens to have with her become important tools to help her adapt and survive in a new world. She carries with her basic stuff like homework, snacks, a couple of gadgets (of the communicative and musical type), and a small emergency kit (needle and thread.) As the story progresses, she finds she can use most of these things to be proactive and in some cases do some epic things.
If you were to be abducted today while out and about, what would you have on you that might be useful? What's your favorite survival story and what basic, everyday item used in it made you smile or think "Cool!"? Do you have a story of your own where a character must do the same thing or something similar? When you travel what is the one thing you have to have no matter what?