The Mountain Hardware Flip bag is 35/50. Of these types of bags, that's the only one I'd get. I'd also take a look at the Thermarest Down Comforter. Those are soooo comfy. We have the Down Comforter, the Alpine Down Blanket and the Tech blanket. Love those. Because of what they are, what they're made of, and how they're configured, I've used my Down Comforter in temps as low as 30 degrees and as warm as 45.