[inner bag] 20D recycled polyester taffeta Imported 3N1 System Bag - This modular bag design offers just what you’d expect: three bag configurations in one simple, yet technical sleep system that stays attached to your pad, so you won’t roll off in the middle of the night. Use just the outer bag for warm summer nights, just the inner bag when temperatures start to drop, and on the coldest trips combine both for ultimate warmth - it's the only bag you need for 3-season camping, backpacking and everywhere in between. Comfort - The Big Agnes Padlock Sleep System secures the outer bag to your sleeping pad, letting you move freely without rolling off (pad sold separately). The Pad Cinch System adjusts to various pad sizes, with a self-equalizing drawstring and middle securement for extra stability. The inner bag mimics the award-winning Sidewinder sleeping bag, designed for side sleepers and moves with you as you shift. Warm - Maximum thermal efficiency is achieved when inner and outer bags are layered, using offset quilting to minimize cold spots. Keep your head snug and warm using the inner bag's jacket-style hood. The spacious, rectangular shaped outer bag is constructed with no-draft collar, no-draft wedge, and two no-draft, anti-snag dual side zippers with zipper garage. Ultimate Comfort and additional hand warmth with hand tuck pockets at the top of outer bag. Materials - Insulated with 650 fill Downtek PFC-Free that maintains insulating value even while wet, using bluesign approved water-repellent chemistry without intentionally added PFAS. Shell & Pad Sleeve: Recycled 20D polyester ripstop with a water-repellent finish without intentionally added PFAS. Outer bag lining and Inner bag: Recycled 20D polyester taffeta with a water-repellent finish without intentionally added PFAS. Bells & Whistles: Two-way zipper unzips from top or bottom of both bags for easy temperature control. Pillow Barn attached to pad sleeve keeps a pillow (or jacket) in place while allowing head movement. Includes mesh sack for long-term storage and a smaller stuff sack for active use. For minimum compressed size, pair with a Big Agnes Compression Stuff Sack or Superlight Girdle (sold separately). The Lost Ranger 3N1 sleeping bag combines two sleeping bags for three different configurations - providing a sleep solution that's just right at a wide range of temperatures. This modular bag design offers just what you’d expect: three bag configurations in one simple, yet technical sleep system that stays attached to your pad, so you won’t roll off in the middle of the night. Use just the outer bag for warm summer nights, just the inner bag when temperatures start to drop, and on the coldest trips combine both for ultimate warmth - it's the only bag you need for 3-season camping, backpacking and everywhere in between. These lightweight, down-fill bags deliver Comfort and versatility no matter your sleep style or temperature preference.