When a night in Alaska flirted with freezing, the 35°F Ice Peak gave our tester more warmth than looked possible from a thin bag that weighs within a PowerBar of a pound. Credit 650-fill down and a tight, body-contoured shape that’s great for thermal efficiency (but not rolling around). The lightweight, low-bulk 20-denier microfiber shell helps the bag compress down to Nalgene-size, and it’s treated with a DWR finish, which repels light moisture.
The shell is still quite breathable in mild temps. “After 10 nights with wildly fluctuating temps and humidity,” our tester reports, “I’d say that there are few bags with a wider comfort range. But don’t expect to extend the rating by wearing more clothes. I’m 5’10” with broad shoulders, and layering up compressed the fill, creating cold spots.” Bonus: A larger-than-average interior mesh pocket could hold a novel. $180; 1 lb. 2 oz.; 35°F