Big Agnes Lost Ranger UL 3N1 0 Down Sleeping Bag

-18°C Comfort Limit, 652g of 850 Fill Power DownTek (US Method)
Weighs 1286g (Regular bag)
Code: SS22139V
  • £504.99
  • (FREE UK & EU Delivery)
  • RRP £549.99
+ In Stock Now   |   Usually dispatched within 24 hours

The Big Agnes Lost Ranger 3N1 is a unique concept that offers a solution to for every kind of sleeper and is perfect for a range of different temperatures.

Big Agnes says:

The Lost Ranger UL 3N1 0° sleeping bag is part of our latest evolution of the Big Agnes Sleep System. This modular ultralight 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 that you need for 3 season camping, backpacking and everywhere in between. These ultra-lightweight, down-fill bags deliver comfort and versatility no matter your sleep style or temperature preference. 

The Big Agnes Lost Ranger 3N1 offers a unique concept that makes this bag useful for many different situations and eliminates the need for having to own multiple sleeping bags for different times of year and different environments. 

The concept of this bag is so simple yet something that I'm surprised that has not been though of before, which is to offer a solution to the problem of finding a bag that is suitable for every kind of sleeper in a range of different temperatures.

If you are a side sleeper then there is the common issue of getting cold spots because you expose the back of the bag when on your side. The quilt option allows you to keep the heat in while on your side, by using the mat attachment to get a good seal that prevents any insulation loss. The cover that goes over the top of the mat provides a comfortable layer between you and the mat so there is no discomfort from your skin pressing against the mat as can often be the case with quilts. 

The Pad Cinch System is one of the best we have found in terms of ease of use, the seal you get around the mat and the fact that it is compatible with a wide range of mats (between 20"x66"-30"x78") as it is very adjustable. 

If you are a warmer sleeper then you can use the quilt on its own as it can be adjusted at the sides to allow more air to get in and there is also more room to move about if you're a bit restless. If you a generally a colder sleep then you have the option of using the super lightweight down bag which has a good rating of -7°C  for its weight and the 3/4 zip down the front means that if you roll on your side then you're not getting any discomfort from leaning on a side zip. 

Finally, the quilt and bag can be combined to increase the rating to -18°C making it suitable for 3 season temperatures and also for anyone who is a particularly cold sleeper. Having the bag inside of the quilt also comes in handy if you are restless as you won't roll off the mat during the night. At a total weight of 1.2kg for the total bag it is pretty competitive to the weights of other bags with a similar temperature range. 

Although Big Agnes have come up with a unique concept of the 3N1 this is something that could be the norm over the next few years because it seems to be a solution to a lot of sleeping bag issues. 

- Reviewed by BasecampGear

Help and advice:
  • 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
  • Ultralight, durable materials with 850 fill Downtek™ water-repellent down, for those who aren't willing to sacrifice comfort for compressibility
  • 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 quilted construction 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 a single no-draft, anti-snag left side zipper 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
  • Regular and Long sized bags available
  • Storage sack & stuff sack included

Temperature Ratings

  • Full System: -18°C / 0°F
  • Inner: -7°C / 20°F
  • Outer: 7°C / 45°F


  • Our weight: 1286g (full set, excludes storage bags)
  • Our inner bag weight: 780g
  • Our outer bag weight: 508g
  • Fits: 183cm / 6ft
  • Brands total bag weight: 1.33kg / 2lbs 15oz
  • Brands inner bag weight: 794g / 1lb 12oz
  • Brands outer bag weight: 510g / 1lb 2oz
  • Fill Type: 850 DownTek
  • Total fill weight: 652g / 23oz
  • Inner bag fill weight: 454g / 16oz
  • Outer bag fill weight: 227g / 8oz
  • Compressed size: 25 x 23cm / 10" x 9"


  • Our weight: 1454g (full set, excludes storage bags)
  • Our inner bag weigtht: 879g
  • Our outer bag weight: 576g
  • Fits: 198cm / 6' 6"
  • Brands total bag weight: 1.45kg / 3lbs 3oz
  • Brands inner bag weight: 879g / 1lb 15oz
  • Brands outer bag weight: 567g / 1lb 4oz
  • Fill Type: 850 DownTek
  • Total fill weight: 737g / 26oz
  • Inner bag fill weight: 510g / 18oz
  • Outer bag fill weight: 227g / 8oz
  • Compressed size: 25 x 24cm / 10" x 9.5"

Pad Size Needed

  • Minimum: 50 x 183cm / 20" x 72"
  • Maximum: 76 x 198cm / 30" x 78"
  • Rectangular shape recommended

Material & Construction

  • Shell: Ultralight nylon rip-stop Lining: Ultralight nylon rip-stop fabric
  • Pad sleeve: Ultralight nylon rip-stop
  • 850 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFC-free water-repellent chemistry
  • Insotect Flow™ vertical baffles contour to your body to provide a more comfortable fit and keep you warmer
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