Gear Reviews Western Mountaineering Bristlecone MF December 26, 2012 Katie Herrel Share this Facebook Icon Twitter Icon Email Icon Join Backpacker Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Join Backpacker Create a personalized feed and bookmark your favorites. Join for free Already have an account? Sign In Brand: Western Mountaineering Model: Bristlecone MF Specs Weight 3lbs. 15oz. Existing modelOur widest sleeping bag.