I keep a TON of gear in my car year round. I'm like a mobile FEMA outpost. <img src="/images/graemlins/grin.gif" alt="" /> Since I already have blankets, tents, candles, flares, glow sticks, fire extinguishers and a whole lot more, the only think I added for winter (which is pretty mild down here...73 degrees right now) is a heavy goose-down gortex coat w/ hood. Nice to have as I'm walking down the side of the road with my broken down car left miles back. Not really necessary since I have a vareiety of blankets and shelter items that would keep me just as warm but I'd rather have the coat when given a choice.
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Learn to improvise everything.