Big Agnes Lost Ranger 3N1 15 Sleep System - Long
Big Agnes Lost Ranger 3N1 15 Sleep System - Long
Big Agnes Lost Ranger 3N1 15 Sleep System - Long
Big Agnes Lost Ranger 3N1 15 Sleep System - Long
Big Agnes Lost Ranger 3N1 15 Sleep System - Long
Big Agnes Lost Ranger 3N1 15 Sleep System - Long
Big Agnes Lost Ranger 3N1 15 Sleep System - Long

Big Agnes Lost Ranger 3N1 15 Sleep System - Long

Regular price $589.00 Sale price$471.20 Save $117.80
Tax included. Shipping calculated at checkout.

The Lost Ranger 3N1 15° sleeping bag is part of the latest evolution of the Big Agnes Sleep System. 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. 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.


  • 3N1 System Bags offer 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 3N1 bags. 
  • Regular and Long sized bags available. 
  • Storage sack & stuff sack included. 


  • Recommended Pad Size:51 - 76 x 183 - 198cm
  • Max User Height:1898cm
  • Compressed Bag Size:24 x 24cm
  • Stuff Sack Size:14L 20 x 45cm
  • Foot Girth:117cm (Inner) | 147cm (Outer)
  • Hip Girth:145cm (Inner) | 163cm (Outer)
  • Shoulder Girth:165cm (Inner) | 183cm (Outer)
  • Total Fill Weight:595g
  • Total Weight:1.39kg
  • Inner Bag Weight:624g
  • Outer Bag Weight:765g
  • Inner Bag Fill Weight:312g
  • Outer Bag Fill Weight:283g
  • Fill Type - Tech:650 DownTek™


  • Shell: Lightweight nylon ripstop
  • Outer bag lining and Inner bag: GRS certified 100% post-consumer recycled polyester taffeta featuring a PFC-free water-repellent finish
  • Pad sleeve: Lightweight nylon ripstop
  • 650 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFC-free water-repellent chemistry
  • Quilted construction

The standard local delivery time from our store in Melbourne for orders placed before noon is 2–7 business days via Australia Post standard delivery. Express Post is also available. Please see our Shipping page for more details. International Orders are subject to flight availability.

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Big Agnes


At our core, we want to inspire you to get outside and find the same appreciation for the backcountry we have.

Big Agnes started over 20 years ago with the goal to build better gear to get people out camping. It was a simple idea rooted in providing comfort to brave souls sleeping in the backcountry and keeping them on their sleeping pad. Who could have imagined two decades later we would be making award-winning gear, changing the sustainability game with solution-dyed tent fabrics, and helping you haul all that gear in backpacks?

Based in a ski town in northwestern Colorado, our backyard is an outdoor paradise, and our testing grounds are within sight of our office. The Continental Divide Trail is home to some of our favorite trails for skiing, hiking, and mountain biking; the Mount Zirkel Wilderness beckons us with its high alpine summits. The Yampa River flows a stone’s throw from our office; and on most lunch hours the office is quiet enough to hear a pin drop while we’re out finding fresh air or fresh tracks of one kind or another.

Being surrounded by outdoor recreation makes us appreciate our environment every time we get outside. We strive to incorporate practices from design ideation to end-of-life solutions committed to protecting the outdoors. Our social impact is greater than the gear we manufacture. We partner with over 20 organizations that help protect our public lands, support sustainable practices, and lead in equality and inclusivity.

Our urge to sleep under the stars and breathe fresh moun­tain air is what continually drives us and keeps us motivated. In the end, the bluebird summits and nights spent listening to raging creeks or even highway noise have made the journey awesome, and truth be told, we wouldn't want it any other way.

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