After hiking the John Muir Trail over a dozen times, Colby Brokvist from Adventure Journal knows a thing or two about the important gear to bring with you. See his coveted list here. The only thing we would add: the HOBOROLL of course!
Women's Ultimate Packing List for a John Muir Trail Thru Hike - Packing List for JMT includes everything from clothes to backpacks! http://herpackinglist.com/2013/10/female-packing-list-for-a-john-muir-trail-thru-hike/