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Trends in sleeping bag design: commentary on emerging ultralight synthetic bags and hybrid down-sythetic sleeping bags; synthetic bags that weigh a pound; down bags 14 oz and up; photos and specifications for new bags and technologies including the Marmot Fusion, Marmot Pounder, Marmot Atom, Big Agnes Crystal, The North Face Propel, The North Face Fission, and Sierra Designs Nitro; upgrades to the Sierra Designs Wicked Fast series.
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