A SureFire can save your life!
Be warned: once you buy a SureFire you will end up with several of them. They make all normal flashlights look like toys. Borrow someone?s SureFire and take it home. Then at night collect all your best flashlights. I tried a 3D cell MagLight, a 6 volt lantern battery flashlight, and other flashlights. There is just no comparison. The SureFire has a pure white light that will blind an attacker or light up a hiking trail about as far as you want to look. They are also great for working on a car. Shine the light in there to look at the belts or oil leaks etc.
I suggest you buy a SureFire G2 first.
My family has: G2, C2, and two E2e. I'm thinking of getting a yellow G2 for my PSK/CamelBack.
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Thermo-regulate, hydrate and communicate.