How to Choose Sleeping Bags for Backpacking
Big Agnes Lost Ranger 3N1 0 Sleeping Bag
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With a modular design that offers 3 bag configurations in 1 simple-yet-technical sleep system, the Big Agnes Lost Ranger 3N1 0 sleeping bag adapts to weather and your sleep style for absolute comfort.
Shop similar productsKey Details
Fill
650-fill-power DownTek down
Temperature Rating (F)
0 degrees (F)
- System consists of 2 down-filled bags that can be used together or separately, depending on your sleep style and temperature preference
- Maximum warmth is achieved when the inner and outer bags are layered, using offset quilting to minimize cold spots—this combined configuration has a tested lower limit of -1°F
- Using the inner bag alone provides warmth down to about 20°F; the outer bag alone provides warmth down to about 45°F
- 650-fill-power DownTek™ down repels water while maintaining its insulating value
- Water-repellent finish is PFC-free
- Insotect Flow™ vertical baffles contour to your body to provide a more comfortable fit and keep you warmer
- Sleep on either side using the inner bag alone or within the outer bag; 3/4-length, anti-snag ambidextrous zipper stays out of the way when side sleeping
- Inner bag design mimics the 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 a no-draft collar, no-draft wedge and 2 no-draft, antisnag dual side zippers with zipper garages
- Hand-tuck pockets at the top of the outer bag provide additional hand warmth
- 2-way zippers at both the top and bottom of the inner and outer bags allow easy temperature control throughout the night
- Easy access to the discreet pillow barn on the pad sleeve keeps your pillow tucked in all night
- Outer bag lining and inner bag are made with postconsumer recycled polyester taffeta featuring a PFAS-free water-repellent finish
- Pad Cinch System adjusts to a variety of pad sizes; a self-equalizing drawstring easily connects the bag to the pad, and the middle securement feature provides extra stability
- For the regular-length bag, use a rectangular sleeping pad measuring 20–30 in. wide and 72 in. long (pad not included)
- For the long-length bag, use a rectangular sleeping pad measuring 20–30 in. wide and 78 in. long (pad not included)
- Create a doublewide system bag by mating two 3N1 bags with compatible zippers
- Storage sack and stuff sack included
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Big Agnes Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | -1 degrees (F) - ISO |
| Tested Comfort | 12 degrees (F) - ISO |
| Temperature Rating (F) | 0 degrees (F) |
| Temperature Rating (C) | -18 degrees (C) |
| Shell | Ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 650-fill-power DownTek down |
| Sleeping Capacity | 1-person |
| Lining | Polyester taffeta |
| Sleeping Bag Shape | Semirectangular |
| Stuff Sack Size | 9 x 20 inches |
| Stuff Sack Volume | 20.8 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) Contains recycled materials |
Buying Advice
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Anonymous
NC
Too Constricting
1 year ago
In theory this is a good bag, but in reality it was not comfortable at all. The mummy bag was too tight around my face and I felt like I was being smothered. It wasn’t roomy enough to curl my arms up, so they were by my sides which made rolling around inside the outer bag difficult. The zipper pulls are very small as well, so it’s not easy to find them and open the bag quickly and/or easily, which was a problem when I needed to GET OUT OF THIS BAG NOW! I never camped in this bag, I tried it out in my living room and couldn’t take it after ten minutes. I ended up getting the Big Agnes Diamond Park 0° bag instead.
Age:45–54
Height:Shorter than 5'
No, I do not recommend this product
George
Austin, TX
Great first impressions
3 years ago
I bought this because it could cover a wide range of temperatures (including well below what I'm likely to encounter locally). My only other bag was much toward for Texas spring and summer temperatures.So far I've just used the outer bag, and it was quite comfy with a low in the 50s. It was easy enough to attach to my inflatable sleeping pad.
Age:65–74
Weight:175–200 lbs.
Height:5'10"
Yes , I recommend this product
Anonymous
Bakersfield, CA
Lost Ranger lost its zippers
1 year ago
As a fan of Big Agnes and owner of the original lost ranger I was excited to jump into this 3N1 system with the zero-degree rating. I read that when the testing is done, it is done with a base layer worn by the individual. So my first night out i was in 38 deg temps at an elevation of 6000 ft. I was cold to say the least and had to layer up to achieve warmth for sleep. The next night, and a subsequent trip later and temps a 42 and 46, staying in that main base layer, warmth was fine. The issues I see are the zippers, having a bag inside a bag, although a nice idea it left me in a constant fight with the zippers in both bags, the base bag would have issues tracking and pulling up against the inserted sleeping pad and it would snag against itself, the inner bag would not only snag against itself but even snag on the inside of the outer bag. Fighting zippers through the night for either temperature adjustments or that call of nature has led me to return the product. I am hoping to stay with the brand but perhaps to just get a separate solo zero degree bag.
Age:45–54
Weight:250–275 lbs.
Height:5'9"
EME
7 months ago
Age:45–54
Weight:200–225 lbs.
Height:6'0"
Yes , I recommend this product
Rebecca
Maryland
Toasty warm, but soooo fiddly
7 months ago
As advertised, this 3N1 sleep system is warm. It kept me toasty for a long night in the mid-20s. I wish I had other good things to say about it. The drawstring pad system is a huge pain. It’s tough to adjust and doesn’t seem to stay put, which means that the pillow barn is basically useless while the outer bag just wants to slide off. It’s way more complicated and way less functional than the elastic system that BA used on their double-wide bags (I have two and love them.) I used it with the Rapide SL sleeping pad, which is a great product. Then there’s the zippers. The zipper on the outer bag is the chunky plastic one that BA has used forever - it looks a little cheap but works well enough and is easy to get unstuck. The mummy bag has a metal zipper, which looks like an upgrade but feels super flimsy. And it is gets snagged a lot. Somehow this zipper got stuck on the outer bag and put a hole in it my first night of use. So I need to figure out how to repair that. Even apart from the hole, this thing sheds like crazy. Like, waking up inhaling loose feathers. As for sizing, I’m 5’5” and wear medium-sized women’s clothing. I had enough room in the mummy bag but anyone larger or taller would probably feel like they didn’t. The outer bag is very roomy. Even squished into a compression sack, the cold-weather combo is pretty big. If I had it all to do over again, I would have just bought a single 0° bag. :/
Age:35–44
Weight:150–175 lbs.
Height:5'5"
No, I do not recommend this product