My small kit has a 10x10 silnylon tarp, a 6x8 silnylon tarp, a Thermo-Lite 2.0 Bivouac Sac, for cold weather I add a 2 pound over-bag. This type of shelter setup served me well on SAR missions, and I was comfortable on a number of unplanned overnights.
My large kit has a 2 man tent, 0 degreeF sleeping bag, and thermarest pad.
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Our most important survival tool is our brain, and for many, that tool is way underused! SBRaider
Head Cat Herder