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The Marmot Hydrogen 30 Down Sleeping Bag delivers enough warmth for ultra-light cool-weather climbs and backcountry excursions, while still weighing in at a wispy one pound for light and fast climbs and hikes. This bag features Marmots Pertex Microlight Nylon Ripstop material that helps give you the perfect balance of weight and durability that we all strive for in a backpacking bag. With the lightweight design and full baffle construction the Hydrogen will be your favorite choice on your next expedition.