As a wildland firefighter, I spend a lot of my summer sleeping under the stars. I learned after my first season how much difference a bivy sack can make when you wake up covered in morning dew at 5am and you have to pack up to go back on the line. This bivy is small enough to pack away without taking up much room at all. Its water resistant enough that morning dew is no longer an issue (I have not slept in it in the rain yet). And it is tough enough to use on a 14 day roll up here in the pacific northwest. If you want to pack light, keep dry, and protect your sleeping bag from being scraped up, this is for you.