The Ortovox Bivy Pro is a mainstay in our hiking, climbing, and ski touring backpacks. Its lightweight design makes it easy to stash next to a first aid kit, and once it's deployed, the water-resistant fabric and heat-reflective lining keeps one or two people warm and protected from the elements in the event of an unexpected overnighter. What we love most about this bivy, though, is its versatile design that can be converted to a sun awning or stretcher if necessary.