Kikkerland's pocket-sized mini survival kit is something you'd ideally never have to use but will be extremely handy to have around if you find yourself in a bad situation out in the wilderness. It comes with 10 items that between them can serve a total of 30 functions:

1. Flint and striker
2. Razor blade
3. Multi-function knife
4. Fish hook with line and bait
5. 6. 5-in-1 emergency whistle
6. Emergency foil blanket
7. Wire hand saw
8. Candle
9. Pencil
10. Earplugs

All of it fits into the included tin case, which can easily be carried in a pocket or unobtrusively stashed in a bag.

Get the kit for $35 on Amazon.