MSR Pro Bivy
MSR Pro Bivy, When MSR set out to build the ultimate Pro Bivy they enlisted the help of professional mountaineers to get it right. The result' An ultralight quick-pitch bivy that fits between rocky outcroppings and withstands raging mountain weather. With ripstop nylon full waterproofing and breathable fabric you can sleep well knowing you're protected from the elements before setting out on another day of testing your physical and mental capabilities in the alpine. And while you're chasing your objective the bivy packs down to the size of a water bottle and weighs less than a pound so you can continue your light-and-fast mission on the mountain.