Down bags practically disappear when you pack them in your backpack, making the Sierra Designs Zissou Sleeping Bag perfect for summertime backpacking. Not only is its down insulation loftier and easier to pack than sleeping bags with synthetic insulation, but the down's hydrophobic treatment also helps the down stay warm in damp environments. The Zissou also features Sierra Designs's exclusive, self-sealing vent at the foot to let cool air in on surprisingly warm evenings.
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