There's a thousand ways the world could end. We won't bother listing them all here. The important thing is to be prepared for as many of them as you can without going too bunker-style crazy. This survival tin has the basics, including a six-in-one penknife, wire saw, and a braided rope that extends over six feet. Keep it close by, and toss it in your bag whenever you go on a trip. Who knows when it'll come in handy?