The Mont Hibernator Bivy Bag, totally waterproof, breathable, durableA Bivy Bag is the ultimate in lightweight, compact shelter systems. A quality Bivy Bag will be waterproof, durable and, very important, breathable. Mont Bivy Bags use Hydronaute Pro fabric which is extremely waterproof and breathable, keeping out rain and ground moisture while expelling perspiration from inside. The Hibernator Bivy is spacious inside, packs down to a tiny size and has been used around the World in all weather conditions.

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