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Big Agnes Blackburn UL 0 Sleeping Bag

Big Agnes Blackburn UL 0 Sleeping Bag

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Product Description


The Big Agnes Blackburn UL 0 Sleeping Bag is one of the most technically designed Big Agnes System bags with a Flex Pad Sleeve design, durable nylon ripstop shell fabric, and extra warm 850 fill power DownTek™ water repellent insulation. The streamlined silhouette on this Big Agnes sleeping bag increases thermal efficiency while the Free Range Hood gives you freedom to lift your head. Complete with an included storage sack and stuff sack, the Big Agnes Blackburn UL 0 Sleeping Bag is great for backpacking, camping, or more! 


  • Zipper Garage
  • Mate together left and right zip bags
  • Anti-snag zipper for a smooth, quick zip
  • Exterior loops for hang drying or storage
  • Interior fabric loops for sleeping bag liners
  • No-draft collar, no-draft wedge, no-draft zipper
  • Mesh storage sack & polyester ripstop stuff sack
  • Streamlined silhouette for increased thermal efficiency
  • Flex Pad Sleeve  easily connects your bag to your pad  
  • Free Range Hood gives you the freedom to lift your head.
  • Jacket-style hood opening contours to the face for a comfortable fit
  • Fill weight: Small 22 oz. / Regular 24 oz. / Long 26 oz. 
  • Stuff sack size: Small 9x20in. / Regular 9x20in. / Long 9x20in.
  • Bag weight: Small 2lb. 6oz. / Regular 2lb. 10oz. / Long 2lb. 14oz
  • Pad Sleeve: Small 20-25x66in. / Regular 20-25x72in. / Long 20-25x78in.
  • Compressed bag size: Small 9x20in. / Regular 6.5x7.5in. / Long 7.5x8.5in. 
  • Lining: Nylon taffeta
  • Construction: Insotect Flow™ 
  • Shell: Nylon ripstop shell fabric with a water repellent finish 
  • Insulation: 850 fill DownTek™ - a water repellent down that uses a PFC-Free, bluesign™ approved chemistry.

Customer Reviews

3.8 / 5.0
17 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 1 out of 5
30° Bag at Best
First, I rarely craft reviews. I have to be fairly disappointed to do so. The temperature rating on this bag is way off. It is a 30° bag at best. And, yes I used the Big Agnes Q-core insulated pad and fluffed the bag up. Unfortunately, I am past the timeframe for a return. What a total "let down" - no pun intended. If you want a warm bag, don't purchase this one.
August 17, 2021
Originally posted at
Rated 2 out of 5
Not ideal
Overall pretty disapointed with this bag. I upgraded to this bag from a 15 degree park bag. And this one, although a little lighter, is much tigher in the shoulders. And is significantly colder. I used that park for 3 seasons of Archery Elk, all of which consistantly got below freezing at night, and never got cold. The Blackburn is a huge difference for comfort and warth. Wish I had never gotten rid of my old one.
August 8, 2021
Originally posted at
Rated 3 out of 5
Research required
This is probably one of the hardest reviews I've written. I wanted to love this sleeping bag. It packs down super small, it's light, it's made with comfortable material, and it's perfectly roomy. The design with the exception of the zipper is overall above average.
The bag does have some cons though. The zipper seems to get snagged every...single...time. Sometimes, it gets snagged several times in one attempt.
The outside doesn't shed water, it absorbs it immediately. This bag is new, it shouldn't.

Lastly is my fault. I attempted an overnight gear test just a mile from the trailhead. I was sleeping with an insulated pad with an R-Value of 4.4 on the snow with ambient temps in the low 30's-high 20's. I was sleeping with dry military thermals and fresh wool socks and expected to be on the warm side throughout the night. The cold spot under my hips never went away. I went to sleep at 8:30, by midnight the cold spot had grown and it was uncomfortable. By 4 am, rolling from side to side wasn't working anymore and I was cold. By 5:30 I was starting to shiver.
Don't let the last part dissuade you from purchase, just beware that unless you have a very high R-value pad, you will be cold.
January 3, 2021
Originally posted at
Rated 5 out of 5
Great Bag!!!
I used this bag on an Alaskan Caribou bow hunt. It was a 10 day backpack hunt. Bag worked flawlessly! Very comfortable and warm. Nighttime temps were in the 20–40 degree range. So not too cold as to test the rating of it. However my hunting partners had cheaper bags and they got cold. Bag is extremely light weight and packs down small. Perfect for backpack hunts.
October 16, 2020
Originally posted at
Rated 5 out of 5
Go-to bag
I sleep very cold but I don't like wearing a million layers to bed so this is the bag I take on every camp trip. I am a fair weather camper, so I'm not out there when it's below 20 degrees at night so I can only speak to my personal experience, but I LOVE this bag. Feels like I'm sleeping on a cloud it's so comfortable and I'm always warm enough.
September 14, 2020
Originally posted at
Rated 2 out of 5
Temperature Rating Way Off
I really wanted to love this bag! It was lightweight, highly compactable, and the cut was beyond comfortable. Then, I took it out in the field....and FROZE!! I don't usually write negative reviews, but it seemed important to pass along (to Big Agnes and future purchasers) what I learned with this sleeping bag.

I work outdoors for a living and have for twenty years, so I am familiar with different sleeping bags. While there are some great features on this one, I think the temperature rating for this sleeping bag is not advertised correctly. I was VERY cold sleeping in this bag during 20 degree and 15 degree temperatures. I would consider this bag to be a 25 degree or 30 degree rating.

After trying out this bag and freezing in it during nights that weren't even close to a low of 0 degrees, I called Big Agnes customer service. They recommended that I add an extra foam layer of insulation to my sleeping pad set-up. This did not help. I tried my own layers and then no layers to see if that shifted the situation. No luck. The amount of fill on the top of the bag, combined with the lack of any fill on the underside of the bag (by design), just didn't seem to hold up AT ALL to temperatures anywhere close to its rated 0 degrees.

Finally, I decided to return this sleeping bag because the temperature rating was so far off (and I really needed a bag that kept me warm close to 0 degrees). I received 80% credit from Big Agnes towards another sleeping bag. While I appreciated the credit, I felt frustrated because this sleeping bag was SO FAR from being accurately rated for temperature, in my opinion. A zero degree bag rating seems like false advertising and so I wish the company had addressed the problem as more than a simple "I didn't like my new sleeping bag" return. I used my credit to to purchase a Big Agnes -20 degree Starfire Bag. Fingers crossed!
September 3, 2020
Originally posted at
Rated 5 out of 5
Comfort Rating
Wanted to add comments regarding Comfort Rating. From many years of use and retail experience. Take the comfort ratings on bags, and add 20. If you know its going to be cold, a beanie and a puffy can add considerably.
August 18, 2020
Originally posted at
Rated 2 out of 5
Such a disappointment. Maybe a 25 degree bag
I was very excited about this bag, but it has failed to meet expectations and the temperature rating is way off. I would call this a 25 degree bag. I've done 3 nights in this bag and all three nights at a steady low temp of 30 degrees, I froze. I called big Agnes and they recommended I shake around the insulation. I met a sales rep at an rei parking lot event and asked... He recommended I use better insulation under my bag. With the big Agnes sleeping pad recommended by him, I still froze again and I wore base layers with my warm hat. This bag has got to go. Glad I tested it out in the backyard before on the trail. For the money this thing cost, I feel ripped off.
April 12, 2020
Originally posted at
Rated 5 out of 5
Traditional sleeping bag and lightweight quilt had a baby!
Well worth the price! Don't usually leave reviews, but this hybrid bag warrants one. The Big Agnes sleep system with the sleeping pad keeper is the way to go when the temps dip below freezing, which I experienced on two separate occasions so far. One time the temps were down in the teens Fahrenheit. And the other time I actually got to see how well it did when the mercury dipped down to 9*F. The Blackburn UL handled it like a champ. It's like a light-weight quilt and a traditional sleeping bag had a baby. Can't say enough about my Blackburn UL. Stoked!
November 12, 2019
Originally posted at
Rated 5 out of 5
Great for bikepacking
I took this bag on a bikepacking trip in Colorado. Slept though a snow storm on the third night and was plenty warm. The material and zippers are working great so far.
November 12, 2019
Originally posted at