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Get some well-deserved rest on your next yurt tour or backcountry trip with the MontBell U.L. Super Spiral Hugger #1 Sleeping Bag. Premium 800-fill goose down inside this bag's innovative stretch baffles hugs you close and insulates you from the cold's prying fingers. With advanced cold-fighting features like a double insulated draft tube, draft collar, and adjustable hood, you can stay toasty in a drafty yurt while you dream of the pow day to follow.

  • With an EN comfort rating of 26F and lower limit of 15F, this bag is best suited for spring through fall nights in the mountains or winter nights in milder climates or sheltered yurts
  • Premium 800-fill goose down offers optimal insulating power while also compressible and ultra-light
  • Tough Ballistic Airlight Nylon shell boasts a 100-wash-rated Polkatex DWR coating to shed spindrift or tent condensation and last for years
  • Double draft tube inside the zipper, drawcord adjustable tunnel hood, and draft collar seal you off from exceptionally cold air
  • Super Spiral Stretch System combines a bias cut (at 45-degree angle), gathered quilting, and elasticized baffles to provide stretch and a snug fit inside the bag to eliminate dead air space and cold spots even when you move in your sleep
  • Mini-Tube Construction features Flow Gates inside the baffles to secure the down and trap more heat
  • Two-way, auto-locking zipper doesn't move during the night and joins your bag with another MontBell bag; left and right zippers available (depending on inventory)
  • Ultralight bag weighs only 2lb 5oz (regular) to ensure easy hauling through rugged mountain terrain
  • Hang loops let you air out the bag every morning to keep the down dry and functional
  • Included tapered, stretch stuff sack easily packs the bag down to a 7.1 x 14in package to easily fit in your pack
  • Included cotton storage sack helps you preserve the lofty down fibers when at home
  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

Stretches and is super warm

  • Familiarity: I've put it through the wringer

I took this backpacking when it dumped snow outside and temperatures dropped to single digits (F). I was so warm and cozy. The elastic seams made it so comfortable for me to move my legs around without feeling cramped or claustrophobic. Hands down the best purchase I have ever made. I've gone through 3 other sleeping bags and none came close to this one (Big Alps, Nemo Nocturnal 15, Marmot).

It does leak down a little bit the first few times using it (not a lot comes out either), but after the 3rd time using it doesn't anymore.

It packs down nicely and is super lightweight for the warmth and comfort it provides.

I love this bag

  • Familiarity: I've used it several times

I've tried a lot of sleeping bags. In the quest to reduce weight, I sacrificed comfort. Bad move!

The UL Super Spiral does a good job of keeping weight down without sacrificing comfort. Montbell's super stretch technology really does work. It keeps the bag close to your body, no matter how you toss about, without restricting movement. As someone who tends to contort into weird sleeping positions, super stretch is priceless.

The 15� rating seems a bit high to me. I'm comfortable down to at least 10� before I have to toss on extra layers. But, I sleep very warm, so YMMV.

It's not the lightest 15� bag out there, but it's definitely the most comfortable, and it's still pretty darn light.

Good bag

  • Familiarity: I've put it through the wringer

I've used this bag for several years now. It's still in like new condition! It will last as long as you care for any down product.

This bag is pretty toasty if you're even a borderline warm sleeper. I tend to sleep hot, and have used this bag fully unzipped in upper 20s temps with just silk weight baselayers. The hood is definitely a little claustrophobic as mentioned in a previous reviews. Most nights I use it as some extra pillow fluff, and sleep with a light beanie/buff on.

The bag is fairly packable for a 15 deg. bag. I tend to just stuff it in my pack with a liner to fill in empty spaces.

Overall, a very good bag. I got mine on sale about 2yrs ago. Not sure I would pay nearly $400 for one, but I've been very satisfied with my purchase.

Not that warm for me.

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

I had this bag out in mild desert night temps 40's/50s and was borderline cold. Regular size , 5'10", 155 lbs, on a nemo insulated pad. I originally read the reviews for the #3 bag that seemed appropriate but was warned it ran cold so I went with this. Turns out this bag is not that warm either. My Marmot 32 degree bag seems warmer than this. I am not sure what to think but the down seems to get real thin when the bag stretches thus losing insulation ability.

I'd go with the long if you are over 5'10 also. The hood of the bag was smushed down over my face at just shy of 5'11".

Losing Down?

I have only had this bag for a few months. Used about 10 nights or so and have already seen some down feathers leaving the bag. This is my first down sleeping bag, therefore i am not sure if this is normal. I love this bag so far, it packs down small and is very warm for the size, i hope this wont become a problem.

Losing Down?


    i've had a 15 down "hugger" old school style(prior to spiral but still pucker type stitching) and is very warm and comfortable, the key in my opinion is the way they sew the baffles that keep the bag close to you but not claustrophobic. the caveat with this bag was the zipper that would easily un-zip but this has been rectified with newer models.

    Montbell's UL SSDH#1 is like sleeping on a cloud. I'm a side sleeper, and this thing stretches with my movements, so I never feel claustrophobic, as I have in other bags. If I go camping in the summer, I unzip the zipper completely and use it as a quilt. The description states that the color is orange, but it's really more of a red. I was able to purchase this in a short (I'm 5'4) and it's a perfect fit.

    Will Backcountry be restocking this item?

    Looking for a good dry sac for the Regular...

    Looking for a good dry sac for the Regular size bag, I'm considering the Sea To Summit eVAC Dry Sac. Just wanted to know what the best size is and if anyone has a better recommendation on the dry sac? Thanks!

    Best Answer

    First, the Sea To Summit eVAC dry sac is an awesome dry sac. You would probably want to go with the 13liter which is a Large. You might check out getting the Sea to Summit eVent compression dry sac in a Large as well. You can get a bit more compression with the straps. Both are great though.

    What are thoughts on this vs. the UL spiral...

    What are thoughts on this vs. the UL spiral #1? what are the advantages of the extra weight of the super spiral over the spiral?

    Montbell has a little PDF on their website for this difference.

    It looks like the difference between super spiral vs. spiral is in the elastic stitching, which allows even more stretch than just the biased cut in the regular spiral.

    I'm a pretty big dude (powerlifter). 5'10"...

    I'm a pretty big dude (powerlifter). 5'10" 250; broad shoulders with a size 48 sport jacket. I have had a hell of a time finding an ultralight bag that fits. Will this work or are there better choices?

    Tom - the montbell bags with the spiral weave do tend to conform to a bigger body, but they're going to still feel like they are wrapped around you pretty well. Big Agnes bags such as the Mystic SL would be great options if you want a roomier fit - especially through the shoulders, although many of them will cost you a touch of extra weight.