Product Description Roomier than most sleeping bags, the Celsius Regular -18ï¾°C/0ï¾°F is filled with SuperLoft Elite four-channel hollow fiber insulation to keep out the chill on fall, spring, and summer evenings. The bag comes with all the bells and whistles of more expensive bags: shoulder and zipper baffles, adjustable mummy hood, interior storage pocket for keys and valuables, and an Oxford compression sack for easier packing. Now before you buy, letï¾s talk about temperature ratings. When manufacturers rate a bag for 0ï¾°, we mean the bag will keep you from freezing to death in zero degree weather. Temperature ratings are survival ratings, not comfort ratings. For comfort, get a bag rated 15-20 degrees colder than the night temperature you expect. If you need an extreme cold-weather bag, you might want the TETON Sports Celsius XL -32ï¾°C/-25ï¾°F bag. A little bigger and a little warmer. The bag also offers zippers on both left and right side, so you can zip two TETON bags together and create a double bag for couples. Just be sure to order one left-hand and one right-hand zip. For a definition of left- and right-hand, visit www.TETONsports.com. From the Manufacturer The Celsius Regular bag has higher quality materials and construction than most bags in its price category. Filled with SuperLoft Elite 4-channel hollow fiber insulation to keep out cold, the Celsius bag comes with all the bells and whistles usually found on more expensive bags: shoulder and zipper baffles, adjustable mummy hood, interior storage pocket, and an oxford nylon compression sack to pack it away when not in use. The internal storage pocket is sized for keys, wallet, watch and other valuables. Two Celsius Regular bags zip together with left and right side zippers.The bag is temperature rated to -18ï¾°C / 0ï¾°F which means it will be warm for all but extreme-winter camping.