Maybe you just need a little extra protection from some unexpected winds while snow camping in the backcountry. Or maybe, you need to insulate your injured friend while you go get help. Either way, an emergency bivy sack is an essential part of any complete backcountry travel kit. This double-wide bivy is made from a durable nylon material and packs into a compact stuff sack. When you never expected to spend the night but find you need to, the Ortovox Gemini Double Shelter gets the job done.