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The popular Marmot Helium Sleeping Bag (15° F) Down packs smaller than a loaf of bread, weighs less than two pounds and keeps you warm down to 15°, making it ideal for lightweight mountaineering and backpacking. The Helium is packed with 850+ Fill Power Goose Down and is reinforced with Down Defender to help improve Water-Resistance in wet conditions. This bag also features a full length zipper and also a zipper garage that keeps it concealed and windproof. Stay warm when the temperature drops this season with a bag that is lightweight, tough as nails bag constructed with Pertex Microlight material which give you the durability you need and a weight that you'll absolutely love.