Kelty Cosmic Ultra 0 Down Sleeping Bag

-15°C Comfort Limit, 1000g of 800 Fill Power DriDown
Weighs 1844g (excluding stuff sack)
Code: SS21651
  • £264.99
  • (FREE UK & EU Delivery)
  • RRP £284.99
+ In Stock Now | Usually dispatched within 24 hours

The Cosmic Ultra range provide exceptional value for money with a serious amount of down providing you with a warm sleeping bag. These are well made bags that are durable, comfortable and have some impressive features.

Kelty says:

The Kelty Cosmic Ultra 0 is the ultimate in a lightweight mummy. We’ve taken our top-selling Cosmic Bag and added an 800 fill DriDown version, with all the perks too. The new trapezoidal baffle construction improves is ideal for retaining heat—and it’s just one of the reasons Cosmic is still our favorite three-season superstar. We also love the natural-fit foot box for happier feet, and a PFC-free water-repellent coating for a healthier environment.

Kelty's Cosmic Ultra 0 Down Sleeping Bag provides a huge amount of warmth and comfort. The bag uses trapezoidal baffles to allow the down to loft more and trap more heat. Using 1000g of 800FP down you are getting a massive amount of insulation which is reflected in the -15°C Comfort Limit. It has all the features you'd expect from a top of the range bag with a draft tube down the anti-snag zipper, shoulder baffles and a close fitting hood. 

For the set of features and level of warmth at this price there are some other costs and these come in the weight of the bag and it's pack size. The Cosmic Ultra definitely provides excellent value for money as long as you are fine with the heavier weight and larger pack size compared to more expensive alternatives. It is certainly a perfect piece of kit for car camping in particularly cold conditions.

- Reviewed by BasecampGear

Help and advice:
  • Innovative trapezoidal baffle construction = thermal efficiency
  • Premium lightweight 800 fill DriDown
  • Environmental and health friendly C0 and PFC-free DWR fabrics
  • Zippered internal stash pocket for headlamp, cell phone or actual… stash
  • Buttery-soft and durable 20D Nylon shell and liner
  • Zipper draft tube keeps warm air in while anti-snag zipper makes it easy to get in and out
  • Natural fit spacious footbox = more room to wiggle your toes
  • Comes with stuff sack for quick departures

Temperature Rating

  • Temperature Rating: 0.0°F / -18°C
  • ISO Comfort Temp Rating: 18°F / -8°C
  • ISO Limit Temp Rating: 5°F / -15°C
  • ISO Extreme Rating: -33°F / -36°C

Regular Specs

  • Weight: 1844g (excludes storage bags)
  • Fill Weight: 35.27 oz / 1000 g
  • Fits Up To: 72 in / 183 cm
  • Length: 78 in / 198 cm
  • Shoulder Circumference: 62 in / 158 cm
  • Hip Circumference: 58 in / 147 cm
  • Footbox Circumference: 40 in / 102 cm
  • Stuff Sack Size (L x W): 10 x 19 in / 25 x 48cm


  • Insulation: 800 Fill Power DriDown™
  • Shell Fabric: 20D 400T Nylon
  • Liner Fabric: 20D 400T Nylon
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