The Sierra Designs Nitro 800 Quilt is a hybrid sleeping bag built for backpacking and camping. It features some of the lightest and loftiest down insulation on the market, and Sierra Designed treated the insulation with DriDown to retain its lofty warmth in wetter climates. The Nitro is wider than most mummy bags to provide better coverage. There are pockets for your hands and arms to prevent drafts, and the hood keeps you covered when it's really windy. It hides away when the weather gets better overnight. The Nitro includes a stuff sack and a storage sack. It's the cooler of the two Nitro 800 Quilts from Sierra Designs.