Backpacker 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 Existing modelOur widest sleeping bag. When you buy something using the retail links in our stories, we may earn a small commission. We do not accept money for editorial gear reviews. Read more about our policy.