The Nunatak Raku is one of those ultralighters concepts that just hasn't caught on yet. But if you think about it, why do you carry a insulating jacket, and then a separate sleeping bag? Well, personally, I wear my jacket in my sleeping most of the time, but it would make sense to just have one insulating piece of gear, for reduction of bulk and weight. The
concept doesn't come cheap though, starting at $574, weighing in at 2lbs 1oz. Steve over at Suluk had one custom built to keep him warm down to 0 degrees.
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