Feel better day and night.

Big Agnes designed the Lost Ranger 15-Degree Down Sleeping Bag to maximize the efficiency of its materials, so it milks all the performance possible out of the lightest, most compact construction possible. That means you stay more comfortable in the bag and while you hike. The Lost Ranger also has Big Agnes' famous sleeping pad pocket and insulation-free bottom so you never roll off your sleeping pad again and you don't have to carry around a bunch of unnecessary insulation.

  • 15 degree rating offers lots of versatility for camping in all conditions but the hottest part of summer and the coldest part of winter
  • Downtek treated water repellent down maintains loft and insulating properties when wet and provides anti-microbial and anti-bacterial protection
  • Rectangular shape for more space and greater comfort in multiple sleep positions
  • Nylon microfiber ripstop material for durability
  • Draft collar seals out cold air
  • Full-length zipper with draft tube seals out cold air and allows you to zip left- and right-zipper bags together
  • Full-length sleeping pad pocket so you never roll off your pad again
  • No insulation on the bottom of the bag, pad keeps you warmer than smashed insulation would
  • Insotect Tubic insulation system provides the maximum cubic loft for optimal thermal efficiency
  • Super-light (just over 2.5 pounds)
  • Pillow pocket for maximum sleep comfort
  • Includes mesh storage sack and nylon stuff sack

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Big Agnes Lost Ranger Sleeping Bag: 15 Degree Down

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Here's what others have to say...

5 5

Buy this bag. It's great.

  • Gender: Male
  • Familiarity: I've put it through the wringer

Check out my video review I posted here to get a better overview of the Lost Ranger 15. My YT channel also has reviews for other Big Agnes products and other outdoor gear.

Im 6'4". If you over 6ft get the long. Reg is 72*20 Long is 78*20

Weight is 3 pounds 1oz in the bag that it comes with. I suggest buying a granite gear stuff sack to really compress it down.

Made with 650 fill downtek. It is a water resistant down. I have never gotten wet in the bag and have used it a ton.

I slept in the BWCA in May with lows in the lower 30s wearing only boxers and a tshirt and I stayed warm. I also tend to get cold pretty easy.

I also have the BA Cross Mtn. 45 and the 2 work awesome together. You put the lost ranger inside the cross mountain 45 and it brings the temp rating down to 0 degrees. The 2 bags together weigh just over 5lbs. They have the same zipper and can be zipped together. Ive done it. Works great, easy to do.

The great part of the BA sleep system is the pad slides underneath the bag via a slit. This keeps you and your pad connected and you cant slide off you pad at night.

Overall, its awesome. Lightweight, warm. I think it feels really cozy too.

Buy this bag. You wont regret it.

My review... Big Agnes Lost Ranger 15

Warm, Comfy, light and can be paired with other Big Agnes sleeping bags to bring your temp rating down. Love the Big Agnes sleep system where your sleeping pad stays connected to your bag via the sleeve on the bottom of the bag.

Great bag. Highly recommend.

Do the regular and long versions both use a 20"X72" pad? Or do I need a longer pad for the long version?

Responded on

Hey Roger Ault,

The pad sleeve for the regular length is 20"x72" / rectangular and for the long it is 20"x78" / rectangular.

Has anyone tried pairing a long bag with...

Has anyone tried pairing a long bag with an insulated Q-Core long and wide pad? I know it's not meant for this size, but curious if anyone has tried it.

Best Answer Responded on

I don't think I understand what you're actually trying to ask; both of those items, in Long sizes, are recommended for people up to 6'6" to use comfortably. Apropos of the size comparison, could you be a bit more specific with what you want to know? Performance using the two in sync, perhaps?

Responded on

I called Big Agnes and got an answer...a long / wide Q-Core pad (78x25) will only fit the Park series of Big Agnes sleeping bags.

4 5

Seems good, but I was cold...

  • Familiarity: I've used it once or twice and have initial impressions

I paired the 15 degree bag with the Air Core Sleeping pad, both in long. I was comfy padding wise, but way too cold camping in the back country with the nights getting no colder than 35 degrees. Another person in my party had the same bag/pad arrangement and he was plenty warm. I don't know if this falls under the "women are colder than men" view, but I was not warm. I tried extra clothing, I tried less clothing, but I was still cold. I loved how the bag and pad integrate so that I stayed on the pad, I loved the length (I'm almost 6'3"(which is why I didn't get a "women specific" bag)), but am frustrated that a 15 degree bag won't keep me comfortable temp-wise unless it is 50 degrees out. (The perils of online shopping.)
I think I will try a liner, or if nothing else, I'm pretty sure my old bag will fit inside this one...
(Ironic that the 4 star rating is equivalent to "pretty cool")

Responded on

Make sure you have the correct side facing up on your pad.

Responded on

I have no issues with my bag. I wear thermals before I go to bed and zip it all the way up to keep the warmth in...

Responded on

I have this bag and it is very warm. I use the Big Agnes Insulated Air Core sleeping pad. It is rated at 15 degrees as well. I highly suggest this sleeping bag. Warm, comfortable and lightweight. I pair it with the BA cross mountain 45. Together it brings the temp rating down to 0 degrees.

5 5

If I could only have one sleeping bag...

  • Familiarity: I've put it through the wringer

Oh wait, I only have one sleeping bag. This bag has met all of my Colorado outside lifestyle needs. I put a bivy sack over it and polar fleece liner in it on winter outings (frequently without a tent), leave it unzipped in the summer and hang a leg, and zip it to my wife's (TNF) bag when we're on the trail together. It does it all with minimalistic adjuncts. It compresses easily, and is really, no s$!t, my only sleeping bag, which I use at least 30 nights/year, and have for the last 3 years. No regrets about this gear decision.

Great 15 degree bag

Great 15 degree bag

Here's our trusty gearhead Kyle Wall taking a snooze on the clock in the ranger bag. Wake up Kyle who do you think you are George Costanza?!?! Kyle is about 6 ft tall and he had plenty of room in this bag. Fire over any questions you have.

Responded on

Which size is Kyle using? I'm about the same height and thinking of getting this bag. Also, how well does this bag pack?

Responded on

Kyle is in the reg size. The bag packs extremely well. Stuffs to 8 x 17.5 which i think is great for what you're getting here.

Responded on

The specs say "Max User Height: [regular] 5 ft 10 in, [long] 6 ft 6 in," but you say Kyle is ~6' and in a regular bag. I am 5'11" and am trying to figure out which bag to get. Would there really be plenty of room in a regular for me?

Responded on

The bag will still have room for you in a reg, if you like to have a little more room then i would suggest a long version. As far as pack size and weight it's not really all that much more weight and size. If you're afraid of being crammed then i would suggest to find a store and check it out in person first for sure.

5 5

Solid, No fuss bag.

  • Familiarity: I've put it through the wringer

I am pretty rough on gear and I expect it to stand up to whatever I throw at it, this bag does the job. I bought this bag to use during the summer while we were on fire assignments. I wanted a bag that was lightweight and that I could stuff in my gear bag and still have room for everything else I have to carry on a 14 day assignment. It lived up to my expectations and more. I bought a STS e-vent stuff sack to store it in and it squeezes it down to a nice 8x8" package. It kept me comfortable in anywhere from 40 to 15 degree nights and thats really all I can ask for. I usually just slept in shorts, socks and a merino beanie.
Once, we had just gotten off of a 18 hr shift and went to bed down in the middle of the day. I threw the bag down under some aspens and never had to worry about the durability due to the thicker material on the bottom. I woke up to an unexpected mountain squall and the bag got wet but it dried very quickly and never lost any loft in the down. Really can't ask for anything more in a bag in this price range. I am a Big Agnes fan for life.

5 5

Great bag but not for 15deg temps

  • Familiarity: I've put it through the wringer

I got the DT Lost Ranger last year for dual-sport motorcycle trips. I like it's roomy size, light weight, and compact pack size. I'm not sure why they bother to call it a 15deg bag and then say it's comfortable to 30degrees though? Marketing I suppose... Around freezing I have difficulty staying asleep even w/ fleece pants/shirt (I use it with a Exped Downmat 9). One thing I like about the bag is it's roomy cut for layering bags. If I expect it to get near/below freezing I put a Pitchpine 45 inside the LR. With a Lost Lake 30 inside the LR I've slept comfortable at -7deg. (Yes, I love BA bags) The Lost Ranger is a great all around bag as long as you don't expect to stay warm at 15deg.

Here it is packed.

Great bag but not for 15deg temps
5 5


  • Familiarity: I've used it once or twice and have initial impressions

Used in southern Utah, temps in the mid-30s and low 40s. Along with the air-core pad this was exceptionally comfortable and I'm a notoriously bad backcountry sleeper. I prefer the extra room and am definitely a fanboy of the integrated pad approach. I got sick of waking up multiple times during the night after rolling off my Thermarest. Packed down nice and small which is always a plus.

Does this bag come with a compression...

Does this bag come with a compression sack?

Best Answer Responded on

Yes, it comes with a nylon stuff sack and mesh storage bag.

Responded on

I purchased a Granite Gear Air Compressor Sack 11L (GRG3291) to replace what came with the bag from Big Agnes (more storage than compression). It allowed me to really compress this puppy down. Fit nice and snug at the bottom of my backpack.

What is the recommend washing technique ...

What is the recommend washing technique for treated down bags such as this one.

Responded on

Hey Michael,

According to BIg Agnes, you would treat it the same as washing your regular down bag. In fact, you may find you won't need to wash it as often since Big Agnes claims that DownTek retains its loft better over time than traditional down.

Here are the washing instructions provided by BA:

5 5

Really solid bag

  • Gender: Male

This is such a great bag for the price. It's fairly light, and will pack down to a decent size too.
As far as performance, I've slept in temps from 15-60 and have been plenty comfortable. Matched with the insulated sleeping pad, you always stay attached to your sleeping pad so rolling off in the middle of the night is no longer a concern.
I haven't experienced any significant loss of feathers after a few years and this bag is still working like a charm