DESC: At only two pounds, the Big Agnes Zirkel 20-Degree Down Sleeping Bag easily cuts weight off your three-season camping kit. The insulation in sleeping bags becomes useless when it's compressed. By replacing the insulation with a sleeve for a Big Agnes 20-inch-wide mummy-shaped pad (not included), Big Agnes brought the Zirkel's weight down to about two pounds and created a system that keeps you on your pad while you sleep. Inside the water-resistant shell is warm, light 800-fill down. The Zirkel also has an integrated pillow sleeve, where you can stuff your jacket, making yourself even more comfortable while you sleep.