Montbell Seamless Down Hugger 900 Sleeping Bag #2

-6°C Comfort Limit (EN13537:2012), 300g of 900 Fill Power Down
Weighs 658g (Regular bag)
Code: SS20395
  • £509.99
  • (FREE Delivery on orders over £15)
+ In Stock Now | Usually dispatched within 24 hours

(Unfortunately, we are unable to ship MontBell products outside of the UK)

The Seamless Down Hugger is a pretty revolutionary sleeping bag. The use of spider yarn instead of baffles, the level of stretch in the material and all at a lightweight with the highest quality materials available. This is an impressive bag. 

Montbell says:

Since 1975, Montbell has been innovating and creating better outdoor sleeping experiences with our sleeping bags. The Seamless Down Hugger series came about when we asked ourselves “How can we improve the down's ability to insulate?" When fully lofted, down traps air which provides insulation. The more air in the sleeping bag, the better it insulates. We began scrutinizing the elements of the sleeping bag that affect lofting ability. An idea proposed was to eliminate the baffles. Without baffles, the down would be unhindered and could loft to its fullest potential. But baffles prevent down from shifting and developing cold spots. Our next hurdle was developing a baffle replacement. Mother Nature provided inspiration and we developed a specialized thread called Spider Yarn. By placing a web-like layer of polyester yarns throughout the bag, we created a system that traps down and holds it in place. The "Spider Baffle System" was successful in maintaining a set amount of down, though a majority of the down is still able to move freely inside the bag. Although we’ve eliminated most of the exterior sewing lines, the interior features gathered quilts and elasticized stitching to promote comfort. By designing the sleeping bag in this way we’re able to reduce the amount of down used in the sleeping bag while maintaining the same thermal profile. This reduces some weight and provides a better value to our customers.

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Montbell's Seamless Down Hugger 900 Sleeping Bag #2 is a unique sleeping bag for a number of of reasons. Firstly, the baffle-less construction which is immediately clear to see. Montbell have developed a technique where they use threads of yarn to catch the down, a concept based on the spider web. All of the bags we've seen and tested so far have worked really well in keeping down in place and reducing cold spots. The second feature is the spiral stretch system which allows you to move around in the bag more as the fabrics have enough stretch to make movement easier and less restrictive.

This #2 version is filled with 300g of 900FP Down which results in a -6°C Comfort Limit. It is quick to loft and feels warm as soon as you're in the bag. The 7D fabric is one of the ways that weight is saved but it does mean that extra care is needed. It uses a full length, sturdy zip so access is much easier than many other bags. The hood and collar can be cinched separately which is good and the toggles are on the inside for easy of use. Overall, this bag looks great and performs really well.

- Reviewed by Ultralight Outdoor Gear

(Unfortunately, we are unable to ship MontBell products outside of the UK)

Help and advice:
  Choosing a sleeping bag advice
  EN 13537 rating for sleeping bags explained
  Sleeping bag shape and sizes advice
  Sleeping Bag features Page 1
  Sleepin bag features page 2
  All about down filling in sleeping bags
  • Spider Baffle System (Patent pending)
  • Inner: Super Spiral Stretch System (US. Patent NO. 7,900,301)
  • Two way right hand zipper (59 in / 150 cm)
  • Anti-snagging slider cover
  • Tunnel Hood (limits exposure of your head helping keep in warmth)
  • Neck Baffle
  • Hood Adjuster (Draw cord for face hole adjustment)
  • Draft Tube (covering the zipper to shut out cold air)
  • Auto Locking Zipper (to limit zipper ”slip” during the night)
  • Triangle Gusset (Reinforcement at the end of the zipper)
  • Storage / laundry net sack included
  • Stuff sack included (Tapered, bias stretch stuff sack for easier packing)

Temperature Rating

  • EN13537:2012 Comfort: 0°C / 32°F
  • EN13537:2012 Comfort Limit: -6°C / 21°F
  • EN13537:2012 Extreme: -23°C / -10°F

Regular Specs

  • Weight: 658g (excludes storage bags)
  • Fill weight: 300g
  • Max user height: 6 ft / 183 cm
  • Internal Shoulder Girth: 149-194cm (59-75in)
  • Internal Knee Girth: 123-160cm (48-63in)
  • Stuffed size: 15 x 30cm


  • Insulation: 900 Fill Power EX Down
  • Shell: 7-denier Ballistic Airlight Nylon
  • Spider Yarn: 100% Polyester
  • Zipper: Two way right hand zipper (150cm)
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