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25 survival items in an altoids box, useful for you daypack. I used to make these out of BandAid Tins when I was a kid for hiking, horseback riding and what not. Now Altoids are about the only way you can get a tin (useful for boiling water incase you are wondering).
Pocket survival kit in an Altoids can. Would be cool to carry in a purse to have on hand all the time for absolute emergencies. There are a lot of other good tips in the comments. One guy explains how you can repel from a cliff with parachute cord, a carabiner, and some climbing knots. Way cool.