Kelty Cosmic Ultra 20° Degree Down Sleeping Bag

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Size: Right Zip Regular

The Kelty Cosmic Ultra 20 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 Cosmic Ultra 20 Features:

  • 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

Kelty Cosmic Ultra 20 Specification:

  • Liner: 20D 400T Nylon
  • Shell: 20D 400T Nylon
  • Fill: 800DP Dridown

Kelty Cosmic Ultra 20 Materials:


  • Temperature Rating: 20.0°F / -7.0°C
  • ISO Comfort Rating: 31.0°F / -1.0°C
  • ISO Limit Rating: 20.0°F / -7.0°C
  • ISO Extreme Rating: -12.0°F / -24.0°C
  • Bag Shape: Mummy
  • Weight: 2.35 lbs / 1.06 kg
  • Fill Weight: 15.17 oz / 430.0 g
  • Fits To: 72.05" / 183.0 cm
  • Length: 77.95" / 198.0 cm
  • Shoulder Circumference: 62.2" / 158.0 cm
  • Hip Circumference: 57.87" / 147.0 cm
  • Foot Circumference: 40.16" / 102.0 cm
  • Stuff Sack Size: 8 x 13 in / 20 x 33 cm


  • Temperature Rating: 20.0°F / -7.0°C
  • ISO Comfort Rating: 31.0°F / -1.0°C
  • ISO Limit Rating: 20.0°F / -7.0°C
  • ISO Extreme Rating: -12.0°F / -24.0°C
  • Bag Shape: Mummy
  • Weight: 2.51 lbs / 1.14 kg
  • Fill Weight: 17.43 oz / 494.0 g
  • Fits To: 77.95" / 198.0 cm
  • Length: 83.86" / 213.0 cm
  • Shoulder Circumference: 64.17" / 163.0 cm
  • Hip Circumference: 59.84" / 152.0 cm
  • Foot Circumference: 41.73" / 106.0 cm
  • Stuff Sack Size: 8 x 14 in / 20 x 36 cm


Delivery Details

In-stock items are dispatched the same day if ordered before 2pm (Monday - Friday) or the next working day if ordered after 2pm or on a weekend.

Deliveries are normally next working day for orders over £60. If under £60, we sometimes use a 48 hour service. You will have the option to upgrade to a next day service at the checkout.

Special Order items are dispatched within the timescales displayed after selecting your size.

Most orders are dispatched using DPD Next Working Day.

We use Royal Mail 24 for the more remote parts of Scotland, the Channel Islands and Northern Ireland. Please allow a little extra time for delivery in these areas.

For orders under £60, we normally dispatch using Royal Mail 48 with delivery being made in 2 to 3 days. You will have the option to upgrade to a next day service in the checkout.

A tracking number will be emailed to you for all orders over £60 on the day of dispatch.

For orders under £60 dispatched using an untracked economy service, a reference number will be emailed, but you will not get full tracking, only confirmation once delivery has been attempted.

Other Questions

Sometimes you will see 'Special Order' when selecting your size. For these items, we will dispatch once we have received them from our supplier.

An estimated lead time will be displayed for Special Order items.

Yes, returns are accepted within 30 days of purchase so long as it is unused and still in it's original packaging*.

You can return for an exchange or refund.

Refunds are carried out immediately after receiving your item back. Return postage is at your own cost.

* for safety reasons, we do not accept the return of climbing equipment or underwear once it has been tried on.

All items sold come with a minimum 12 month warranty that covers defects in materials or workmanship.

Certain brands offer an additional warranty. You can find this information on the brands own website, or you can contact us for additional information.

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