The Eureka Centerfire 0 Degree Sleeping Bag is a robust, stout, warm and feature-laden performance rectangular sleeping bags. For comfort, the Sip and Zip aids mobility to enjoy reading or sipping while inside the sleeping bag. To use, simply unzip the abbreviated zipper on the left side of the bag. The downwind foot vent can be opened for added ventilation on warm nights. Design features like the full-cover cotton duck shell and 8 point rivet reinforcements enhance the durability and aesthetics of this sleeping bag. The removable, integrated carry duffle bag can be stuffed and used as a pillow. Then, when ready to take down camp, just roll the bag into the duffle, secure with the internal compression straps, and zip closed. The removable, integrated carry duffle bag can be stuffed and used as a pillow.