Big Agnes Lost Ranger 3-in-1 System 15

The Lost Ranger 3-in-1 15° sleeping bag has a modular bag design with 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.  It’s the only bag you need for 3-season camping, backpacking and everywhere in between.  This lightweight, down-filled bag delivers comfort and versatility no matter your sleep style or temperature preference.



  • Shell: Lightweight nylon rip-stop
  • Outer bag lining and Inner bag: GRS certified 100% post-consumer recycled polyester taffeta featuring a PFC-free water-repellent finish
  • Fill: 650 fill DownTek™ repels water while maintaining insulating value – bluesign® Certified PFC-free water-repellency
  • Pad sleeve: Lightweight nylon rip-stop
  • 3-in-1 System offers three bag configurations for temperature versatility with a technical, roomy sleeping space that keeps you on your pad throughout the night
  • Pad Cinch System is adjustable to a variety of pad sizes. The self-equalizing drawstring easily connects bag to pad and the middle securement feature provides extra stability
  • Maximum thermal efficiency is achieved when inner and outer bags are layered, using offset quilting to minimize cold spots
  • Sleep on any side using the inner bag alone and within the outer bag. Three-quarter, anti-snag ambidextrous zipper stays out of the way when side sleeping
  • The inner bag design mimics our award-winning Sidewinder sleeping bag, designed for side sleepers and made to move with you from side to side
  • Keep your head snug and warm using the inner bag with jacket-style hood
  • 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
  • Access from top and bottom of both inner and outer bag with two-way zipper for easy temperature control throughout the night
  • Easy access to discreet pillow barn on pad sleeve keeps your pillow tucked in all night
  • Create a doublewide system bag by mating two 3-in-1 bags
  • Storage sack & stuff sack included
Capacity 1
Inner Bag Weight Regular: 1 lb 4 oz / 567 g
Outer Bag Weight Regular: 1 lb 8 oz / 680 g
Combined Weight Regular: 2 lb 12 oz / 1247 g
Temp Rating 15F / -9C (bags combined)
Stuff Sack Size 17.5 x 8 in / 45 x 20 cm
Fill Type 650 DownTek
Fill Weight Inner: 10 oz / 283 g          Outer: 9 oz / 255 g
Fits Up To Regular: 6′ / 183 cm
Shoulder Girth Inner: 62 in / 157 cm         Outer: 69 in / 175 cm
Hip Girth Inner: 54 in / 137 cm         Outer: 61 in / 155 cm
Knee Girth Inner: 43 in / 109 cm          Outer: 55 in / 140 cm
Compressed Size 9 x 8 in / 23 x 20 in (combined)