An Outdoor Superstar Our Cosmic Sleeping Bag was already giving you a workhorse for the price of a pony. Now, you can get your hands on a legit UNICORN-with "pony pricing" still in play. The Cosmic is an outdoor superstar with cozy 550 fill down and a buttery-soft, durable 20D Nylon shell fabric that will have you daydreaming about more QT under the stars. Let's just say there's a reason it's our most popular bag.