Big Agnes Women's Sidewinder SL 35°

The Big Agnes Women's Sidewinder SL 35° is the lightest bag in the Sidewinder family at 936 g, combining 650-fill hydrophobic down with FireLine ECO synthetic panels at the hips and feet in a spoon-cut pattern built to rotate with side sleepers. Its manufacturer-rated comfort of 2°C and limit of -3°C place it as a warm-weather to shoulder-season piece rather than a cold-camping bag. With just 462 g of fill, this is clearly a summer-weight design — appropriate for its rating, but worth knowing before pairing it with an unexpectedly cold night. A center, full-length zipper and draft tube manage venting and warmth, and bluesign-certified, PFC-free materials point to a more responsibly sourced supply chain than the standard Sidewinder builds. Stuff and storage sacks are included, and the sub-kilogram weight makes this the Sidewinder to reach for when packed weight matters more than the extreme cold-weather range — a reasonable choice for warm-season backpacking where side-sleeping comfort still counts, but with less margin against a colder-than-expected night.