Western Mountaineering Flylite

At 383 g, the Western Mountaineering Flylite is the lightest fully continuous-baffle mummy bag in the range — lighter even than the sewn-through Everlite, despite using the more construction-intensive baffle style rather than the simpler sewn-through approach. Its 203 g of 850+ fill power goose down (a 95/5 down-to-feather ratio) sits inside a 10D nylon taffeta shell with DWR treatment. The manufacturer lists three temperature figures — comfort 7°C, limit 2°C, and extreme -12°C — a realistic three-season range geared toward warmer nights rather than freezing ones. An insulated draft collar and a draft tube along the half-length zipper hold heat at the usual weak points, giving the bag more built-in comfort than a bare-bones summer piece despite the low weight. The short-length cut for users up to 167 cm and a packed size of 25 × 13 cm make it a strong choice for fast-and-light three-season trips where every gram counts. Made in the USA.