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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.
Swiss Mint Survival - A Survival Kit In A Candy Tin. My husband made these for my family for Christmas one year. I'll have to compare items.