What Our Gearhead(R) Experts Are Saying:"I took the Greystone 20 Sleeping Bag on a shoulder-season backpacking trip in the Rockies and was seriously impressed. It packs small, lofts quickly, and the DownTek insulation kept me warm even in damp conditions. The contoured hood and draft collar seal in heat better than most bags I've used at this weight."We count on the Greystone 20degF 600 DownTek Sleeping Bag from Big Agnes when crisp alpine nights call for reliable warmth without the bulk. Built with 650-fill DownTek(TM) insulation and a recycled polyester shell, this mummy bag is a go-to for backpackers, road trippers, and vanlifers who want dependable comfort in a lightweight design. Whether we're deep in the backcountry or sleeping under the stars at a desert trailhead, the Greystone keeps us cozy, dry, and rested for the next day's miles. Its bluesign(R)-approved DownTek fill resists moisture and retains loft even when humidity creeps in, and the water-repellent shell provides extra defense against unexpected condensation or damp tent walls. Baffle construction prevents cold spots while the contoured hood and draft collar seal in precious warmth. An oversized no-draft zipper makes late-night adjustments easy, and we love that it mates with compatible zip bags for shared warmth in the tent. Add in the low pack weight and small compressed size, and the Greystone earns its spot in our pack season after season.