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We don't use the word ingenious too often.

As far as sleeping bags go, 3.9 pounds is pretty light, especially when you're talking about a bag that will keep you warm in the dead of winter. On top of all the warmth, the Big Agnes Storm King 0-degree Sleeping Bag has a roomy rectangular design and can even be zipped together with another rectangular Big Agnes bag. The main reason for such a light weight is the fact that Big Agnes eliminated unnecessary insulation from the bottom of the bag. When you're sleeping on top of insulation, it doesn't keep you warm because it has no loft and therefore no air (or heat) is trapped inside. Instead, Big Agnes put a Sleeping Pad sleeve in its place, so you have the trapped air in the sleeping pad keeping you warm, and at the same time your pad stays underneath you. On to top of that, Big Agnes went with a hydrophobic down fill, so the Storm King will maintain insulating properties if it should happen to get wet.

  • 0 degree temperature rating
  • 650-fill hydrophobic down insulation
  • Rectangular shape
  • Water-resistant nylon ripstop outer shell
  • Down proof nylon taffeta lining
  • Ergonomic hood
  • Draft tube and collar
  • 70-inch side zipper
  • Integrated pad sleeve
  • Nylon stuff sack and mesh storage sack included

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Here's what others have to say...

I'm 6'1 tall , should I go for a "long" instead of a " regular" ...? Thank You!


At 6'1'' you'll want a Long.

Shoot me an email anytime you have questions!

Jared D.

Expert Gearhead



Love This Bag!

    I have been looking for the perfect sleeping bag for a long time. I am a side sleeper and will turn from side to side throughout the night. Most bags I have used don't allow me to bend my knees while I toss and turn. This bag does. It gives me 70 inches of room in the shoulder and 65 inches in the hip area. I am 5'9" and 175lbs and it is also the perfect length for me. I debated between the Lost Ranger and the Storm King. Because I am a cold sleeper I chose the Storm King because if anything I'd rather be too warm then too cold during winter camping. I have used it only twice so far and temperatures were in the low 40s so I haven't put it to the extreme test yet. Both nights I needed to unzip the foot box to let some heat out. The ergonomic hood is also pretty amazing. Even turning side to side my head was always warm and stayed on my pillow. The draft tube and covering was very comfortable. I was surprised at how warm it was without feeling claustrophobic in the head area. It really feels like you're sleeping in a roomy warm cocoon of softness. I am also using the Q core air mattress from big Agnes and love the sleep system idea. I did not roll off my sleeping pad and it performed as advertised. My wife slept in it one night and also loved it and is requesting that I buy her a Roxy Anne ASAP. She is a warm body sleeper so I believe that will be warm enough for her. I usually do not leave reviews on products because it takes so much time to write them but I had to on this bag. I am amazed at how it improved my sleeping experience while backpacking. It isn't the lightest or smallest compressible backpacking bag out there but it is definitely worth the small extra weight for me when it comes to having a good sleep. Big Agnes hit this one out of the park. A big thanks to also. I live in Utah and could just pick it up at the warehouse and not have to wait for online shipping. No one else carries it in the store.

    Unanswered Question

    Would this be considered a 4 season sleeping bag? Is it best to match it with a Big Agnes pad, and if so should it be a 0 degree pad?

    What pad sizes work with this sleeping bag?

    Pad sizes that work with each sleeping bag size:

    Regular (Sleeping Bag): 20"x72" or 51cm x 183cm

    Long (Sleeping Bag): 20"x78" or 51cm x 198cm

    Anytime you have a Big Agnes question, shoot me an email and I'll make sure to work with you 1-on-1!

    Jared D.

    Expert Gearhead




      Just picked this up and pretty excited to actually get it out and put it to the test. I will keep you updated on what I find.

      What do you think... after using it a while, Weston?


      Great at the Canadian Ski Marathon

      • Familiarity:I've used it several times

      I bought this bag after having a claustrophobic panic attack in a smaller mummy bag. This bag is very roomy, very warm, and a good weight. I used it at the 2 day Canadian Ski Marathon, skiing 50 miles Saturday, camping out, and skiing another 50 miles on Sunday. I was very comfortable in this bag at -5 degrees.

      Hello! Is the sleeping bag on sale together with a sleeping pad?

      Hey Andrey,

      This bag is not on sale at the moment. If you are looking to purchase a package please contact our gearheads at 1-855-461-8660 they will be happy to help you out.