Sir Joseph Koteka 850 - Ultralight down sleeping bag

Sir Joseph Koteka - Ultraleichtschlafsack

So far for high-altitude climbers and other extreme sportsmen only a dream: Ultralight sleeping bags with high heat comfort with low weight and pack volume. In this series only the down quality is 800cuin / oz. With the mixing ratio 95/5.

With us still an insider tip, the sleeping bags of Sir Joseph because of the high-quality workmanship and materials next to German and American noble forges.

Sir Joseph Koteka 850

Sir Joseph Koteka 850

Winter ultralight down sleeping bag for extremelly low weight and minimal volume devotees. Thanks to ultralight fabric, accessories and top-class down, Koteka sleeping bag has twice lower weight than the clasical sleeping bag with the same warmth comfort.


  • 170cm sleeping bags models are designed especially for ladies, keeping in mind woman body anatomy and physiology. 170cm model containes the same weight of down filling as 190 cm model, resulting in 170cm model having higher warmth comfort
  • Mummy shape perfectly copies human body
  • Closed chambres prevent down shifting and transfusing in the sleeping bag
  • H chamber construction
  • Closed sleeping bag construction ensures easy washing and maintainance
  • Anatomically shaped cape protects head and face from cold
  • 2D collar divides head- and body-space
  • Cord locks ensure the single-hand regulation of the hood and collar width
  • Two-way zipper ensures both sides (from above and below) sleeping bag release
  • Special interior insulated flap underlaiding the zipper prevents from warmth escape throught zipper and prevents zipper from getting jammed in to the fabric
  • 2 chambres botton increase the warmth comfort in the feet area
  • Compress sack reduces the volume by 30%
  • Storage bag and compress sack are included
  • Only Left zipper

Exterior: Pertex Quantum Y
Inside material: Pertex Quantum Y
Construction: Mummy sleeping bag with H-chamber system
Filling: 850g - 95/5 Gänsedaune - 800 cuin
Temperature ranges (according to standard EN13537):
Comfort -10 ° C | Comfort limit -16 ° C | Extremely -34 ° C
Weight: 170cm: 1160g | 190cm: 1190g | 200cm: 1230g
Colour: Blue

Body size       shoulder   hip      foot

170cm         | 83cm     | 66cm | 32cm

190cm         | 85cm     | 68cm | 33cm

200cm         | 87cm     | 70cm | 34cm


ultraleichter Daunenschlafsack
550,00 €
495,00 €
In den Warenkorb
  • verfügbar
  • 10 Werktage1
Ultralight Fabric - Pertex Quantum Y

Pertex Quantum Y

The unique Y-shaped filaments used inside the yarn lock together to provide a more stable construction. Ultralight fabric used for extremely light down sleeping bags, down jackets and windshells. Despite its low weight this fabric meets high requirements of down - proofness and windproofness.

  • Weight: 28 g/m2
  • Windproofness 90%
  • Breathability 90%
  • Water resistance 380 mm H2O
  • finish DWR


Goose down 800

Goose down of European origin with fill power 800 cui /oz (measured by the European standard).  Is is being used mainly for sleeping bags and cothing where the main criteria is maximum warmth, loft and minimum weight. It is goose down with best parametres, with highest ration of crystal particles. The down is veterinary tested and its qualities are verified by IDFB certificate (IDFB = International Down and Feather Bureau). Goose down is 100% natural, 100% recyclable, easily biodegradable.

Only LEFT zipper possibility. Time-proven YKK® zippers.


The online shop system we used was tested by Trusted Shops and found to be legally safe.

Delivery times - why are longer delivery times?

Every customer wants to receive his new "dream sleeping bag" in a top quality. In this case, the down filling should not be compressed for a very long time by the packaging and storage in order not to impair the natural buoyancy of the down. Therefore, high-quality down sleeping bags from well-known manufactures are only filled with down at the time of ordering. This ensures that every customer gets a "hand warm" sleeping bag in top quality.

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