Dual Arc UL Couples Quilt - 30°F or 20°F

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The perfect couples bag, solving the age old quandary of individual temperature regulation. Dozens of custom options available in the configuration section at the bottom of the page. 

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Custom item. Multi week lead time.

Quilt Comparison Chart Available

The light and compact Arc Concept is here expanded to create the perfect ultralight two person sleeping quilt. 

A common problem with having two bodies in one bag is the different sleeping temperatures often desired, resulting in one person either overheating (most common) or being too cool. Traditional converted mummy bags are notorious for this dilemma because of their inability to vent properly without affecting the other person. Often they get no more than one or two uses before it is decided to return to separate bags.

The Dual Arc UL elegantly solves this problem. The modern backcountry quilt is inherently easy to vent and in the Dual you reap the full benefits of this when sharing the cover with your partner. Simply open or close your side using the adjustable straps, without affecting your neighbor.

The quilt is box baffled and generously filled with the highest quality 900FP down. 

The Dual Arc is sewn with a transverse differential cut. This feature helps boost the loft and insulation value of the down.


Besides the length, there's a choice of two widths. The standard 78" is the backpacker's version: good coverage, nothing excessive, and geared towards function and low weight/bulk.

Increasing the width to 88", especially in combination with an additional upgrade to the massive 30" wide footbox, makes for a truly sprawling cover, perhaps best suited for RV use or basecamp style backpacking. 


We offer a variety of shell and liner fabrics enabling you to customize the quilt. This is an overview of the choices.

A popular custom option is to substitute the lower third of the shell, plus the top collar, with a weatherproof membrane. This aids in moisture control, especially inside modern single wall shelters where condensation can be rampant. Leaving the middle torso section with the traditional breathable ripstop fabric maintains a comfortable environment inside the quilt.

To fill the cavity at the top between the two occupants, the Dual can be outfitted with an optional removable Anti-Draft Pillow, as shown on the images below.

Down Overfill

Additional down (overfill) is also available. Why this? The way campers respond to cold varies from person to person. Our ratings will feel adequate to most, too warm to some and not warm enough for a few. If you know you sleep cold, or are concerned about environmental influx specific to your use, consider adding down.

Quilt Straps

The Dual Arc UL is outfitted with a quilt strap system like all our other quilts, but adjusted to work with the 2 person conundrum.

The length of the pad attachment strap allows you to use two fair sized pads, each of a maximum width of 28". A special buckle holds the strap in place in the middle between the two pads. 

The top edge of the Dual has an additional retainer strap to facilitate easy exit and temperature control, individually side to side.

For more on the straps and their use, please see this page

What's in the box?

The quilt, a set of quilt straps, a silnylon stuffsack and a large breathable storage sack.

The images below show a size 74"L by 78" wide Dual with the 20" wide foot. Also seen are the Anti-draft pillow and details of the straps .


Big Double with overfill

A big thank you on two accounts ..... getting our quilt to us in record time for the first camping trip of the season.... and .... producing a fantastic product.

We awoke the first morning of our recent trip in Banff National Park to find the tent coated in ice ....,temps had been down to -15C ( and this is June ).

We used a MEC Volt 4 man tent .... with an SYNMAT DUO XL sleeping pad. We wore Merino wool long underwear and beanies ..... thats all ....
The camp is at 1730m above sea level.

We are delighted with the quilt .... in conjunction with the pad we had lots of room and slept like babies!

All the best


Custom made quilts are the way to go

I spent my teenage years hiking & camping almost every weekend, in winter & summer, from days to weeks at a time. Loved it.

After a 15+ year hiatus, I decided I wanted my wife & kids to experience life outside the concrete jungle and try camping. I found a lot of great gear in my local camping stores, but innovation in sleeping bags didn’t seem to have come a long way in since the late 90’s. So, I got online to see what other people were using for a sleeping setup these days. That’s where I found ultralight quilts, which seemed to be the answer to warm lightweight sleeping gear I was looking for. There seemed to be a few companies out there making good ultralight quilts with some innovative ideas, but it didn’t take too much more research to find that the ‘top pick’ for experienced campers and hikers seeking high quality ultralight bags and quilts was Nunatak.

After looking at all the quilt and bag options available in the market, I reached out to Nunatak for guidance on having a custom made quilt to suit my & my wife needs. Jan was quick to respond and provided some great feedback, which made the decision making process much easier. Ultimately, I ordered a custom 20° Dual Arc Couples Quilt (now known as the Arc Element Couples Quilt) with:
• Epic Black shell to protect from the elements, kids toys, and for longevity,
• Taffeta Black liner with 2inch differentially cut liner for improved warmth and longevity,
• A 30inch wide footbox for extra ‘wriggle room’, and
• 900FP Goose Down with 1oz overfill to compensate for the more ‘open’ footbox,

I’ve used this bag several times for base camping now and could not be happier. It’s incredibly warm, well built, spacious and comfortable. I chose the Epic fabric for my quilt shell, which I know adds weight and bulk compared to the Pertex fabric, but it’s still far lighter than the single sleeping bags I used to carry around and (I’m guessing) will still be less bulky than carrying 2 sleeping bags. I haven’t had to carry it while hiking overnight yet – it’s too early to get my kids into overnight hiking right now – but I know it’ll serve me & my wife well when that time comes.

If I were asked by a friend or colleague to recommend outdoors sleeping gear, I would recommend Nunatak without hesitation.

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Dual Arc UL Couples Quilt - 30°F or 20°F

Dual Arc UL Couples Quilt - 30°F or 20°F

The perfect couples bag, solving the age old quandary of individual temperature regulation. Dozens of custom options available in the configuration section at the bottom of the page. 

Product Options
Temperature Rating

The rating reflects the lowest temperature during which a well conditioned hiker can expect to remain comfortable throughout a full night. Adequate shelter and ground pad must be used.

30°F / 0°C. Includes differential cut
20°F / -7°C. Includes differential cut
Inside Length
To determine the correct length please refer to the measurements in the chart.
Overall width

The standard 78" width works well as compromise between coverage and lowest weight/bulk.

Shoulder 78" Wide - Foot 20" Wide
Shoulder 78" Wide - Foot 30" Wide
Shoulder 88" Wide - Foot 30" Wide
Shell Fabric

These are the Classic breathable ultralight shell options, typically listed from lightest to most durable. Please go to the Fabric Page for help choosing the shell material.

Waterproof/Breathable Shell Options

The first selection substitutes a black 7d waterproof/breathable shell fabric to the lower third of the quilt, plus the top neck/head opening. The large vertical baffled middle section remain with the classic 10d breathable fabric.
The second choice, represented by 'Full Coverage', will completely replace the 10d breathable material with a full coverage of the 7d waterproof/breathable shell in blue.

Liner Material Options
Choose between lightest - the 10d - or long lasting comfort at the penalty of several ounces extra weight: the 20d
Down Type
Choosing Hyper-Dry moisture resistant down will help combat the effects of perspiration, misting tents and damp air. Nunatak products made with Hyper-Dry down will have a slight increase in bulk over those made with regular down. A 5% increase in fill weight also occur.
900 Fill Power Goose Down, RDS Certified
900 Fill Power Goose Down, Hyper-Dry, RDS Certified
Anti Draft Pillow
Differential Cut
The standard differentially cut design creates a bigger shell compared to the liner. This allows the insulation to achieve full loft and helps eliminate cold spots.
Yes. Please!
Down Overfill
Adding overfill can prolong the life of the down, help maintain loft during moist conditions, boost the temperature rating by a small amount and keep the down volume from shifting. Expect a weight increase ranging from one to six ounces depending on the product, the size and the rating.
Stuff Sack
Our stuff sacks are pretty dope, but current weight saving trends in ultralight circles eschews this once crucial item. So, opt out and save $ while also being very current.