Light, warm, compressible, versatile, and affordable–this is the summer bag that most alpine hikers want. The 800-fill Nitro kept one tester toasty in Idaho's Sawtooths on nights that dipped into the high 20s. Warmth is enhanced by a hood, elastic baffles that eliminate dead space (while allowing unrestricted toss-and-turning), and a half-length zipper that keeps weight down and thermal efficiency up.
But it's not too warm on mild nights, thanks to a zip in the footbox that enhances ventilation. Quibble: The hood perimeter bunches up when you cinch it down to blowhole size, but that's a trivial complaint given the price and performance. Women's version is the Spark. $289; 2 lbs. 2 oz.; 30°F