Sleeping Bags - The North Face Allegheny and Dolomite - as part of the Product Guide series by GeoBeats. Hello, my name's Damon. Out at Sports Basement Presidio. Telling you a little bit about a couple of my favorite Sleeping Bags, The Allegheny and The Dolomite from North Face. At 20 degrees on the Dolomite and 40 degrees in the Allegheny, they are both functional for camping and light enough and pack small enough to backpack with. I think my favorite thing about these Sleeping Bags is you can zip them together and create a very versatile sleep system. Depending upon which bag you put on top, you can have a 20 degree system, you can have a 40 degree system. Great stuff from North Face.