Western Mountaineering Lynx MF

Western Mountaineering Lynx MF is a mummy-shaped four-season bag with a manufacturer comfort rating of -18°C and a limit of -23°C, aimed squarely at winter and cold-weather expedition use. It carries 851 g of 850 fill-power goose down in a 20D MicroLite XP shell, with vertical (V) baffles running the length of the body to keep down evenly distributed rather than shifting into cold spots, plus a draft collar and draft tube sealing off the neck and zipper. At 1362 g, it is heavy next to a 3-season mummy bag, but a weight-per-degree figure near 59 g/°C shows genuine efficiency for something rated below -20°C — the high fill power keeps bulk down relative to the warmth delivered. The short-length cut, sized for users up to 167 cm, saves further weight and packs to 46×23 cm. This is gear for genuine winter camping or high-altitude trips where nights regularly fall below -15°C, not for summer trekking or general 3-season use, where the weight and warmth would be wasted.