Our Divide Series bags are the ultimate mummy bag. 725 fill goose down is the perfect lightweight combination of value and durability. These bags have enough space to sleep with your knees bent, yet are still performance oriented due to their light weight and small packed size. These Bags are designed for use with the 20 wide Mummy Shaped Pads. The Zirkel is a wonderfully versatile bag. It weighs just about 2 pounds and is rated to 20 degrees . From big walls to bagging peaks, the Zirkel will amaze you at how such a light weight bag can be so comfortable. IMPORTANT : All Big Agnes sleeping bags require a sleeping pad. Click here to see