For sale is a WM Alpinlite, long length, left zip, used on two hunts. One small slit in the fabric (less than 1/2" long) that has been patched with tenacious tape (see pics) from the zipper getting caught on the fabric. $425 shipped, Paypal F&F or you pay the fees.
www.rokslide.com
20 degree rating that i would say is pretty conservative, cut for extra layering inside the bag