Big Agnes Sidewinder SL 35°

The Sidewinder SL 35° is a lightweight summer version of the side-sleeper Sidewinder bag, built on a men's-specific fit. The asymmetric cocoon cut paired with body-mapped 650-fill hydrophobic DownTek down delivers warmth and comfort without the pressure points typical of conventional mummy bags, where down at the hip gets compressed under body weight. At 908 g and a 2°C limit rating, this is clearly a summer model — a weight-per-degree figure of roughly 454 g suggests it prioritizes compactness and low weight for warmer nights over year-round versatility. It packs down to 18×15 cm, a solid result thanks to the quality 650-fill down. A full-length center zipper and an adjustable, contoured hood allow both temperature regulation and a snug fit around the head. The DWR-treated nylon ripstop shell, combined with recycled and PFC-free components, makes it a sensible pick for lightweight summer treks where low pack weight and volume matter more than a wide usable temperature range.