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Sleeping Bag Guide

Utilizes premium insulation and incredible stretch for unsurpassed comfort and versatility.

Every time you move or shift positions in your sleeping bag, the warm air trapped in the spaces between you and the sleeping bag also move, creating a draft.

The problem:

eliminate the amount of space between you and the sleeping bag, without making the sleeping bag too tight.

The solution:

make a sleeping bag that stretches.

This way the sleeping bag lightly hugs you, eliminating spaces where drafts can occur but also stretches when you move around.

Thermal Guideline -29°C - -18°C

Thermal Guideline -18°C - -7°C

Thermal Guideline -7°C - 13°C

Premium high fill power down

The warmth of a sleeping bag is determined by how much air the insulation is able to trap, which is proportional to the amount of insulation. The more down or synthetic insulation used, the warmer the sleeping bag becomes. But this also makes the sleeping bag heavier.
To address this dilemma, the Down Hugger series utilizes premium high fill power goose down, which has larger down balls when compared to lower quality down. This means that superior warmth retention can be attained using less down insulation. Premium down also has better lofting properties and recovers better after compression. High fill power down has allowed us to create an incredibly lightweight and compact sleeping bag without sacrificing warmth retention.

About fill power

Fill power refers to the volume in cubic inches that 1 ounce of down will displace. All other things being equal (fabric, construction method, and fill amount), a product made with high fill power down is lighter and more compressible than an equally warm one made with lower quality down.

Down Sourcing

At Montbell, we source down from Europe and Asia to satisfy a variety of characteristics (supply/availability, low cost, consistent quality, humane practices, etc.) and maintain a high standard of quality. We change down sourcing companies frequently to ensure that our customers have access to superior products at the lowest price possible. In the course of these efforts, Montbell never purchases down from operations that practice “live-plucking” methods. We only utilize down plumes and feathers collected as a by-product of water fowl raised to meet the demands of the food industry.


We optimize warmth by utilizing highly specialized fibers
Exceloft now consists of 3 unique and highly specialized polyester fibers. By selecting specific fibers that vary in shape, diameter, and composition we promote improved structure, greater flexibility, and increased multiple random air strata. The greatest points are seen in insular value with the addition of a third fiber and the resulting increase in micro pocketing. In addition, we have bonded these fibers at each point of intersection to create a structural “spring effect” that improves resilience and speeds loft rebound.

Ballistic Airlight

Ultralight yet excellent abrasion resistance

Ballistic Airlight is a nylon that is ultra thin and ultra lightweight, yet has incredible abrasion resistance. Because each individual fiber is tightly woven to create a fine, supple fabric, it doesn't hinder the down's ability to loft freely. In addition, the fibers used to make the Down Hugger 900 series are crimped to provide excellent stretch and feel comfortable against the skin.

About denier:
Denier is the weight of a 9,000m long thread, and in practical terms, it is a good equivalent of thickness. A thread of 1-denier would weigh 1 gram. The lower number the denier, the thinner and more fine the thread.

DWR Treated

The outer fabric of Montbell's sleeping bags features a durable water repellent treatment. This treatment helps keep the insulation in your sleeping bag dry. Water will always try to stay in a spherical shape due to surface tension. When water comes into contact with the surface of a fabric, this spherical shape will break down and the water spreads out. However, if the surface of that fabric is instead treated with DWR, bar-shaped water repellent molecules stick up from the fabric allowing water to maintain its spherical shape and simply roll off the fabric. Although this doesn't mean you can use your sleeping bag in a rain storm and expect to stay dry, it does mean that the occasional drip of condensation from the ceiling of your tent or spilling a little coffee on yourself in the morning will just roll off the fabric and keep your insulation dry.

Super Spiral Stretch System

Bias Stretch and Elastic stitching for unparallelled movement

Montbell has adapted a classic tailor’s trick by integrating a woven fabric “cut on the bias”. By orienting the fabric’s warp and weft threads at 45 degrees to most major seam lines the sleeping bag becomes more fluid or elastic in nature. Additionally, to create an even more comfortable system we utilize an elastic stitch technique to create small “gathers” in the quilting.

The strategic seam orientation and these elasticized gathers offer unrivaled fit and comfort. These gathers in the quilting are what draw the insulation closer to your body and minimize drafty dead spaces. The greatest benefit to using elasticized sewing lines would be the “stretchy” nature of the baffles. These flexible baffles allow our sleeping bags to move with you as you change positions throughout the night.

Tapered Spiral Stuff Sack

Simple, easy compression

Utilizies the same bias cut fabric used for our Spiral Stretch System. Because the fabric stretches, it's possible to alter the shape of the sleeping bag to some degree so it fits in the available space of your backpack. The opening to the stuff sack is wider to enable easier stuffing.
*A cotton storage sack is included with all of Montbell's down sleeping bags for storing the bag long term uncompressed. Storing down sleeping bags uncompressed in the cotton sack prevents the down from losing its lofting abilities.

Down Hugger 800 Half Length

By adopting a classic tailor's trick, using only the best materials available, and re-imagining a trusted mountaineering concept, Montbell has brought unparalleled comfort and thermal efficiency to minimalist backpackers and alpine climbing enthusiasts with our Down Hugger Half Length Series.
First, users are able to extend the utility of an item already carried into the backcountry; the down jacket. Second, we offer 2 different loft options allowing users to tailor their sleep system to the season, region or climate frequented.
Finally, users can personalize the system with down garments of varying thickness to accommodate for individual thermal requirements.

Down Multi Blanket

The Down Multi #5 Long is a versatile camp companion. In summer conditions or warmer desert-like climates integrate your favorite insulated pad and use it in lightweight quilt mode.
For those truly hot nights spread the quilt out flat to serve as an ultra light blanket.
In cold weather situations it functions well as an extra layer to put over your sleeping bag at night.
Our all-purpose summer quilt is suited to paddlers, hikers, bicycle tourists, and international travelers looking for low loft warmth and minimal packed size.

Sleeping Bag Covers & Liners

Sleeping Pads

Other Accessories


The history and evolution of Montbell sleeping bags


Maintenance & Care