Backpacker Brooks-Range Mountaineering Equipment UltraLite Alpini Bivy Sack Existing model October 17, 2012 Katie Herrel Facebook Icon Twitter Icon Email Icon Brand: Brooks-Range Mountaineering Equipment Model: UltraLite Alpini Bivy Sack 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.