Sastrugi

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Zipperless bag. Simple, light and no nonsense. 

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$320.00

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If you need this you will know.

High quality 900 fill applied in a generous quantity, cord at the top, light fabrics, no inward taper until hips. Pro tip: down can be shuffled from topside to undersize, or vice versa.

Perfect inside a synthetic over-bag for gnar conditions. 

Concerned about getting in and out of a zipperless bag, and hot weather venting? Look elsewhere.

Sastrugi; snow eroded by wind into ridges. A skier's nightmare.

Grade 
09/14/2021

The Perfect Bag - NO DRAFTS!

https://imgur.com/gallery/eTGWaKQ pics of my Sastrugi.

I got a 28F sastrugi w/ overfill and have used it for ~6 nights without baselayers (male sleeper). The highest night was 48F which was almost too hot for this bag, but it worked okay with leaving the top open. You can also just drape the whole bag over you like a blanket or roll it down halfway on warmer nights. Lowest night was 36F which was really cozy.

I was concerned about the entrance/exit with the zipperless design, but it's not really a big deal, and it eliminates the draft, so I'm happy with it!

It would pair nicely with an apex/alpha quilt (or bivy) for a wide range of use.

Also of note - I'm 5'10 170lb male and got the 70"/62"/40" dimensions and it was roomy! Especially in the torso region, you can fit a huge parka in if you want!

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Sastrugi

Sastrugi

Zipperless bag. Simple, light and no nonsense. 

Product Options
Temperature Rating
 
18°F - minus 8°C
 
 
28°F - minus 2°C
 
Inside Length
To determine the correct length please refer to the measurements in the chart.
Footbox Size Circumference
40" is the male size 10-11 shoe standard. For side sleepers the 40" is good to size 12-13
 
36"
 
 
40"
 
 
44"
 
Shoulder Width
 
62" inside circumference. Fits most.
 
 
68" inside circumference. Very roomy.
 
 
56" inside circumference. Small frames, skinny people
 
Shell Material

Two options: Ultralight 10d for the lightest, most breathable and best lofting performance. 15d for more durability and tear resistance with only a small weight penalty.

Liner Fabric
 
10d Black Taffeta - Lightest, most breathable
 
Down Type

We use 900 fill power goose down, certified responsibly sourced.

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 untreated down.

 
Untreated
 
 
HyperDry
 
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. The amount depends on the product, the size and the rating.
 
No Thanks
 
 
Overfill evenly throughout
 
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.
 
No stuff sack
 
 
Yes, please include a stuff sack
 
Your Measurements
Optional: Fill in the blanks to ensure getting the best fit. No changes will be made to your size selections without approval
Height 
 
 
Weight 
 
 
Shoe Size