http://tinyurl.com/pb8mqg4
Mountain Hardwear Down Flip 35 / 50F Sleeping BagProduct Review
Click on the link for more reviews
Roomy and versatile semi-rectangular cut
Flip the bag from one side to the other to change temperature rating
Tight 5" baffle spacing creates optimal loft
Can be zipped to another rectangular bag or unzipped as a blanket
Insulated draft tube blocks cold spots