1.877.883.6276. Big Agnes Zirkel SL 20 Sleeping Bag (800 DownTek)-Long-Left. The Big Agnes Zirkel 20 Sleeping Bag stands alone as the ultimate three-season bag. It’s shell is made of Pertex Quantum ultralight fabric and filled with high-grade 850 fill DownTek waterproof down. Coming in at just over 2 lbs, this bag is tough to beat from a weight to insulation stand point. Product Weight: 2.50 UPC: 873840015967. The item “Big Agnes Zirkel SL 20 Sleeping Bag (800 DownTek)-Long-Left” is in sale since Sunday, February 28, 2016. This item is in the category “Sporting Goods\Outdoor Sports\Camping & Hiking\Outdoor Sleeping Gear\Sleeping Bags”. The seller is “thecampsaver” and is located in Logan, Utah. This item can be shipped to United States.