Pretty darn expensive. I love the reviews the Marmot Plasma gets. I remember reading about it in the gear guide for Backpackers. It's too much for my blood and it might stop up my nose. (supposedly allergic to down, I found it an odd coincidence that I touched a down pillow the other day and sneeze. Maybe it was a dirty down. lol.)
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It is one of the blessings of wilderness life that it shows us how few things we need in order to be perfectly happy.-- Horace Kephart