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Bivy on Whitney near Trail camp

Bivy on Whitney near Trail camp

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I took the BD winter bivy out for a test run with my Marmot 40degF on Whitney last weekend and with my Mountain Hardwear 0degF near New Army Pass two weekends before; both times I used a Therm-a-rest NeoAir. While the bivy is nice and lightweight, it doesn't breathe perfectly and is a little tight with the air mattress and 0degF bag; otherwise it is perfect.