Extend the warmth range of your sleeping bag with this vapor barrier liner. It weighs about 5 oz and can be used as an emergency bivy sack if you’re caught out in the wilderness at night. Aaron used this liner in Antarctica when it was so cold that even his Western Mountaineering Bison -40 deg F sleeping bag wasn’t enough. It’s the final answer in keeping you warm in the most extreme conditions on Earth.
Get the Hot Sac VBL on Amazon here: https://amzn.to/2Vm0ZiD
Get the Western Mountaineering Bison sleeping bag on Amazon here: https://amzn.to/2W6eLmL
