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The most obvious thing is an emergency blanket. It will add a lot of extra insulation per gram. It'a good to have one in you bag on any trip. However, a mere blanket is definitely not enough for a...
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The most obvious thing is an emergency blanket. It will add a lot of extra insulation per gram. It'a good to have one in you bag on any trip. However, a mere blanket is definitely not enough for a...