Want TWICE THE FILL and > 50% WARMTH for only $30 more SAVE SPACE and SHAVE WEIGHT with ultralight premium quality duck down filling (superior to synthetic) - nature's best light insulator with the highest warmth-to-weight ratio to beat the cold outdoor winter weather. Buy now and have zero regrets. STAY WARM as a result of duck down insulation capabilities and waterproof fabrics - the microscopic air clusters found in down feathers creates "loft" that traps heat and keeps you warm. HIKE FARTHER with the LIGHTEST MUMMY DOWN SLEEPING BAG available (weighs less than 1.9 lbs) for this quality at the price. Summit any mountain or camp by the summer sea with these compact bags and have room for carrying your favorite fleece blanket or silk liner, goose filled pillow, and pad. LONG LASTING DURABILITY from ultralight water repellent 400T 20 D ripstop nylon fabric liner with two YKK zippers, wide shoulders and large footbox, snag-free velcro, drawstring, horizontal baffles, and compression stuff sack case for storage included. Comes in size Regular or Long (Tall / XL). Equipped for the trailhead, from the Alps to Everest. Hyke & Byke is a new brand of outdoor gear that started small but has quickly made a big impression on outdoor enthusiasts across the country (men, women, and kids alike).