Big Agnes Beeler Gulch SL

One of the most spacious bags we've ever tested, the Beeler Gulch (named for a mountain gully) has room for you to move without fear of getting cold. Two layers of Pinneco Core synthetic insulation trap heat while resisting moisture. Though it's a bit heavy (at 4 pounds, 1 ounce), the Beeler Gulch handles bitter nights without killing your trip budget. [$230; bigagnes.com]