Go hard all day and sleep like the dead all night? We liked this bag for both pursuits. It's light and compressible, thanks to a three-quarter-length zipper, a tapered design, and lofty 750-fill down. The narrow, efficient cut makes it one of the warmest two-pound bags we've seen, but it also limits elbow room for restless sleepers. The DWR-coated nylon shell easily rebuffed morning dew. 15ºF, 2.1 lbs; lafuma.com
Bonus: A curved footbox drapes over your feet naturally.
Bummer: The compression stuffsack's bungee cords do their job admirablythere are simply twice as many as necessary.