Our Cosmic Sleeping Bag was already giving you a workhorse for the price of a pony. Now, thanks to a slew of upgrades, you can get your hands on a legit UNICORN—with "pony pricing" still in play. Our most popular bag, the Cosmic is still a three-season superstar with cozy, quick-drying 600 fill DriDown™. But thanks to refinements like our NEW soft-as-silk nylon taffeta fabric and a handy stash pocket for your headlamp/chapstick/actual stash, you'll be daydreaming about more QT in the…