Ray Jardine, in his PCT Thru Hikers Handbook, would suggest that you not use a compression stuff sack for your sleeping bag. He says that it will, over a thru-hike significantly reduce the loft of your sleeping bag. If anything, he would suggest just the opposite. Use the largest sleeping bag stuff sack you can in order to minimize compression. Steven C. Dopp (afn04345@freenet.ufl.edu)