Permits for overnight backpacking in restricted areas of the Maroon Bells-Snowmass Wilderness in the rugged Elk Mountains west of Aspen go on sale next week. Advance reservation permits ($10) are required for overnight stays in the busiest areas of the wilderness including the famed Conundrum Hot Springs, as well as Capitol Lake, Crater Lake and the Four Pass Loop that includes Snowmass Lake and Geneva Lake. The Four Pass Loop is a 27-mile trek for backpackers and trail runners crossing four high alpine passes that top out over 12,400 feet — West Maroon, Frigid Air, Trail Rider and Buckskin.