These bags are built with quality and comfort in mind. Big River Outdoors  uses two layer offset quilting construction, ultra durable water resistant canvas shells, and super cozy flannel liners. They include two way zippers, so you can zip two bags together for the largest bag possible, and adjustable mummy style hood, a massive shoulder, and zipper baffles.  They are extremely spacious at 100" X 0" X 45" which is perfect for those who want the best night sleep complete with two custom compression straps and a carry case for simple transport.