Big Agnes Storm King Sleeping Bag: 0 Degree Down - $319.95

As far as sleeping bags go, 3.25 pounds is really light. When you're talking about a bag that will keep you warm in the dead of winter, however, 3.25 pounds is ridiculous. On top of the warmth, the Storm King 0-degree Sleeping Bag has a roomy rectangular design and can even be zipped together with another rectangular bag. The main reason for this ultra-light weight is the fact that Big Agnes eliminated the unnecessary insulation from the bottom of the bag. When you're sleeping on top of insulation, it doesn't keep you warm because it has no loft and therefore no air istrapped inside to keep you warm. Instead, Big Agnes put a Sleeping Pad Pocket in its place, so you have the trapped air in the sleeping pad keeping you warm and at the same time you can't roll off the sleeping pad. - $319.95

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