Backpacker Gear Reviews Integral Designs Spartan Bivy New model for this year (Do not check this option if this model was listed as new in last year's Gear Guide) October 21, 2011 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: Integral Designs Model: Spartan Bivy 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.