Sierra DesignsExperience comfortable camping at its finest when you head out in the wilderness with the revolutionary Sierra Designs Backcountry Bed 800 Sleeping Bag. Free from extraneous (and heavy) hardware like ... morebulky zippers and drawcords, this intuitive bag features an oval-shaped opening with an integrated comforter that helps it adapt to variable temperatures. You can tuck the comforter's sides snugly beneath you and stay warm in temps as low as 30 F, or you can pull the comforter out for the warmer nights. Its unique mummy design allows you to sleep on your stomach or side as well as your back, which is excellent because most mummy bags only let you sleep comfortably on your back. Sierra Designs stuffed this bag with lofty 800-fill duck insulation that has an excellent weight-to-warmth ratio so you don't have much weight on your back when you head out on a backpacking trip, and the insulation has Sierra Design's proprietary DriDown insulation that's water-resistant and dries faster than untreated down. Sierra Designs built the Backcountry Bed's shell out of ripstop for durability and the liner out of taffeta for your comfort. This bag also features insulated pockets for your arms so you never wake up in the middle of the night because your hand slipped out of the bag and is slowly chilling. There's also an integrated sleeve for your sleeping pad so you never roll off of it during the night and wake up on the rocky ground. This sleeping bag is light and compressible enough for backpacking and warm enough for chilly nights.