Like something out of a sci-fi movie.

The Spiral System of fabric orientation gives the MontBell U.L. Spiral Hugger #1 15 Degree Down Sleeping Bag a natural stretch that makes the bag more comfortable and makes tent-life more livable. MontBell cuts the woven fabric on the bias and orients the threads at 45-degree angles to major seam lines to make the bag more elastic and fluid. The result is cozy comfort that moves and stretches with your body.

  • Box construction eliminates cold spots caused by seam-lines
  • Drawstring -adjustable neckline for custom fit
  • 800 fill-power down for warmth and packability
  • 12-denier Ballistic Airlight fiber nylon is light and tough
  • Available for shipping only to US and Canadian addresses

Share your thoughts

What do you think of the

MontBell U.L. Spiral Hugger #1 Down Sleeping Bag: 15 Degree Down

? Share a...

Write a review

No file chosen

Rather attach a photo from another website?

Rather attach a photo from your computer?

  • Product review:
  • Share a video
  • Share a photo

How familiar are you with the product?(Optional)

Only jpg, jpeg, png, gif or bmp files please.


Here's what others have to say...

Does the Spiral Hugger have the Polkatex...

Does the Spiral Hugger have the Polkatex DWR finish (or any other type of water resistant coating) like the Super Spiral?

Responded on

It does have the Polkatex DWR finish. Not sure of the actual differences between the two though.

Unanswered Question

Is it the foot adjuster?

In the old model...

Is it the foot adjuster?

In the old model UL Super Stretch Bag, the foot adjuster exist.

"Foot Adjuster"
MontBell bags feature a unique foot adjustment system. A drawstring has been added to the last baffle, allowing the user increased adjustability. For shorter users, the last baffle can be simply closed off completely, reducing the amount of empty space to heat.

I'm 5'2" and 100 lbs. I fear the 5'10" is...

I'm 5'2" and 100 lbs. I fear the 5'10" is going to be way too much for me to heat up. Anyone my size have experience with this bag? Is there a women's shorter version by chance.

Responded on

Being it is a mummy bag, I don't think you will even notice it. You could also put some clothes at your feet, will keep your clothes warm, and reduce the interior size your body does not fill

5 5

Love this bag!

Just got back from the Himalayas and this bag was awesome! Slept comfortably above 17,000 feet and at 0 degrees F.

5 5

Toasty warm bag

My Montbell passed the 25 degree test and I'm sure it will pass the 15 degree test too. Love, Love, Love my MontBell bag!!!

Toasty warm bag
5 5

One of the best 15 degree down bags out there

I've had this bag for a few months now and love it. I have not tested it in 15 degree weather to see how true the rating is, but I have spent nights just below freezing and been plenty warm. I've used it in cool and wet environments and the down survived and kept me warm at night. Regarding the stretch, it is definitely more roomy than my 32 degree Ultralamina even though it is shorter. As someone who moves around in my sleep, this has been a great bag so that when I toss and turn the bag moves with me. There are plenty of 15 degree bags to compare it to, but the most confusing competitor is produced by Montbell.

There are three reasons why I personally chose the UL Spiral Hugger instead of the UL Super Spiral Hugger:
1. Max user height - I am about 5'6" and 135lbs so the standard bag that fits a user 6' tall is a little overkill. If you're 5'9" to 6', you might be stuck between sizes and need the long which fits a user 6'4".
2. The weight - the Spiral hugger is 2lbs where as the Super Spiral is 2lbs 4oz.
3. The stuff size - The Spiral hugger is 6.9"x13" and the Super Spiral is 7.1"x14"

There are 2 non size specific factors I considered:
1. Elastic is what makes the Super Spiral stretch more than the Spiral. But elastic is not the most durable material. It is likely that the Super Spiral will wear out faster.
2. Price - the Super Spiral costs $40 more.

Overall, both are great bags. The Spiral was Backpacker Magazine Editor's Choice 2009 and the Super Spiral is Outside Magazine Gear of the Year 2010. You can't go wrong with either. While the Super Spiral has more "technology" aka elastic and the more recent award, I wholeheartedly endorse the Spiral Hugger for those of you who count ounces/inches/dollars, value the durability of not relying on elastic, and fit better in these bags.

5 5

Non-frozen Sleeping Woman

I sleep cold. This is the first bag I've owned that kept me so warm I actually had to take off some of my sleepwear to keep from overheating. Great night sleep while camping down at Kentucky's Mammoth Cave National Park in December and the overnight temp dropped into the 20s. I also toss a lot but I didn't feel too restricted in this mummy bag. Highly recommend it.

I'm just a hair under 5'8" and weight...

I'm just a hair under 5'8" and weight 170lbs. Would the regular (max 5'10) be ok or a little tight? If not would go with the SUPER spiral since the regular there is listed for a max of 6ft. Thanks in advance. Trouble choosing between the two versions...

Responded on

Your not going to have a ton of room in it but it won't be tight - if you have too much room or too little room, you loose the rating of the bag (too tight compresses and too loose is too much air space). If your a cold sleeper and wear several layers or wear leather boots (or boots without removable liners) and will be sleeping in freezing conditions, you will want a bigger bag so you can put your boots in at the bottom to keep them from freezing.

4 5


This bag is stellar and without a doubt the best bag I have ever owned.

I just had it out for a week at 7500ft and it was easily low 20s at night and was toasty all night long. So far the waterproofing has proved to be excellent. I can tell the difference between the down in this bag and a down jacket i recently purchased. The down in this bag keeps its loft much better and the stitching very high quality (not losing feathers!) compared to the jacket from well known brand.

My only complaint is the drawstring which has no stretch and is awkward to use/close. Elastic would be so much better! I am considering retrofitting my bag with elastic.

5 5

Warm and Light

I have not used my bag yet but have spend the last two years backpacking with friends that continue to brag about this warm and light bag. It also stuffs down small

anyone know how long the zip is? 3/4, full,...

anyone know how long the zip is? 3/4, full, half?? also, i'm 5'10 on the dot is this maximum user height accurate? ive used bags which were supposedly for 5'10 people and squished the footbox resulting in cold feet... :P

Responded on

i have been in a regular length just yesterday and am 5' 10". its long enough , but just barely. i would rather have a bit more room and am getting a long version!


Anyone out there tried this, especially...


Anyone out there tried this, especially someone how could compare it to the Montbell Stretch Hugger #2? I wonder about temperature rating and about stretch and roominess.

I am looking for two wide, light bags that could zip together. I don't want Big Agnes because am not interested in the integrated mat sleeve.


Responded on

only come in right zip unless you go with the super spiral version which is both right and left zip. these are a bit wider than super stretch, but not as stretchy.