Despite what you’d think, lack of water or fire isn’t the main cause of death in the wilderness—it’s actually exposure, says Coyne. Even if you just plan to be out for a few hours, you never know when a storm will roll in. So always carry a non-bulky emergency shelter ($15, rei.com) for warmth. Just angle the 14’x12’ heat-sealed tarp (with breathable eyelets) at 45 degrees for a heat-reflective firewall that will help shield you from biting winds.
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