The contents of a Human Waste Packout system are displayed at the Bunny Flat Trailhead at Mount Shasta, Calif., Friday, Sept. 13, 2002. The large target is held down by four rocks. After use the target is sprinkled with cat litter, that comes in the paper bag at right, rolled up and placed in the paper bag, which is put in a plastic bag to be packed out. On Mount Shasta and at a growing number of national forests and parks across the West, climbers are being asked to bag more than peaks as they take the "leave no...