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A fully functional cross between an insulated down suit and a custom sleeping bag.

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The key features of the Raku are warm sleeves, a deep hood plus an openable foot box. This creates a fully functional hybrid between an insulated down suit and a 3 season sleeping bag. 

From sitting around the dinner pots to lying under the tarp is merely two steps apart. No more chilly transitions between the cozy bag and mandatory visits to the bathroom. Setting up tent, cooking, doing repair jobs, organizing food and gear, sleeping, all is possible wearing the Raku. Life in camp has forever been elevated to an unheard level of comfort and protection against the elements.

The sleeves on the fully baffled Raku can be pulled inside to create a draft collar for greater warmth while sleeping. Around camp the elastic shock-corded foot opening allows for unparalleled mobility if pulled up to the waist. The two way front zipper allows you to sleep in your climbing harness without un-roping.

For ultralight travel in cold conditions this bag eliminates redundant layers while providing complete warmth. 

We offer the Raku in temperature ratings from 40° to 0°. Please see the configuration menu below for a full suite of custom options. From 20° and below the bag is made with differentially cut shell/liner relationship.

Temperature Rating 0°F, 10°F. 20°F, 32°F, 40°F
Baffle height 4.5", 3.5", 2.5", 1.5", 0.75"
Fits to Height Small: 5' 4"....Medium: 5' 10"....Long: 6' 3" ....XLong: 6' 8"
Shoulder width options 30"
Foot Area Circumference 52". Openable footbox
Differentially cut liner/shell Yes, from 20° rating and below.
Fill Weight 20° medium, 22 oz
Fill Weight, size Medium 20° - 22 oz
Total Weight, 0.66 oz/sq. yd shell, size Medium, incl. Hood and Pocket 20° - 32 oz
Zipper 28" - 38" - 48" YKK coil , 2 way
Sleeve end finish (cuff) Shock cord and toggle

Great bag - a good long coat!

I have been using this bag / long coat for the last year plus .... while forward deployed: Warm (mine is a 3 season) / roomy / utilitarian (you can keep your boots on) and in the morning just stand up ... cook your coffee! Great bag -- well worth the money. Get the Hyperfill if you will be using in for long periods or you are worried about rain ...

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A fully functional cross between an insulated down suit and a custom sleeping bag.

Product Options
Temperature Rating
20° rating and below receives a differentially cut shell/liner relationship.
The 0° Raku is very bulky, making the use of the sleeves a little awkward!
Shoulder Width
The standard works for most.
Zipper Length
38" and 48" zippers are YKK #5 two-way inside/out coil.
The 28" option is an ultralight one way #3 coil.
Shell Fabric

Please go to the Fabric Page for help choosing the shell material.

Liner Fabric
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. In some instances they may contain an additional 5% of fill weight.

900 Fill Power Goose Down, RDS Certified
900 Fill Power Hyper-Dry, RDS Certified
Down Overfill
Cold sleeper? Consider adding a few ounces of extra fluff.