Kelty Cosmic 20 Sleeping Bag

Initial Update: 2/9/18

I was able to test out the limits of the Cosmic 20 on a backpacking trip on the Black Mountain Crest Trail. We spent 2 nights on the ridgeline that connects some of the East Coast’s highest peaks.

This was my first use of the Cosmic 20, and because the forecast called for temperatures in the teens, I brought along a liner as well as another zero degree bag in case it got too cold for the Cosmic’s rating.

Night One: 

The temps hovered in the high twenties and if anything, the Cosmic 20 was too hot to have entirely zipped up. To compensate, I partially unzipped the bag and slept comfortably throughout the night.

Night Two:

This was the night that I brought 0 degree down bag for in case the Cosmic wasn’t able to handle the temps.

A steady rain turned to freezing rain which then led to snow as the temps plummeted into the teens. I was comfortable until the temps dropped down below 20 degrees Fahrenheit. I was able to use the sleeping bag liner to add a few extra degrees of insulation and slept comfortably the rest of the night (and realized the the extra down sleeping bag was a 5 lb burden I didn’t need).

We slept on a slight decline, so the bottom of my sleeping bag was wet with the condensation that had leeched into the tent where I had slid down in the tent. I was concerned that with the heavy rain, my toes would be damp, but the bag repelled enough of the water to prevent the moisture from leeching all the way inside. What moisture did hit the bag from the tent, quickly dried out as we ate breakfast.

Snow after night 2.


Rather than using the stuff sack that comes with the bag, I opted to use a much smaller compression sack to pack the Cosmic 20. I was able to compress the bag down to roughly 8 x 7 x 11 in. which makes packing the Cosmic 20 in my back very manageable, only taking up about half of the sleeping bag compartment.

Temperature Rating: 

I was able to test the bag in temps above (mid 30s) and below (mid teens) its 20 degree rating.

Temps above rating: I was toasty and had to unzip the bag halfway down to cool off a little

Temps below rating: Once the temperature dropped below 20, even with the zipped completely secured, I was still cold and  had to slip into my sleeping bag liner  which offered the few extra degrees needed to stay warm.

Check back in about a month for my final review of the Cosmic 20.

Kaleb R.

The Product

Kelty Cosmic 20 Sleeping Bag

This 20 degree down bag by Kelty that has been recently updated to offer some new features and specs.

Things to consider when choosing a sleeping bag:

Sleeping bags are one of the most important pieces of gear taken into the backcountry. There are a number of things to take into consideration when selecting/evaluating a sleeping bag and I will address them all during my review of this bag:

  • Temperature Rating
  • Weight
  • Fill Type
  • Style
  • Compression Size
  • Cost
Temperature Rating: 20° / -7°C

A 20 degree rating means this is a 3-season sleeping bag (maybe 4-season depending on where you are using it) that should keep those using it comfortable down to temperatures of 20 degrees. I will make sure to test the bag out in conditions that are at or below this temp range.

Weight: 2 lbs 13 oz / 1.266 kg

I am testing out the “Regular” sized Cosmic 20. At 2 lbs 13 oz, I wouldn’t place this bag in the lightweight category, but it is a respectable weight (especially at it’s price point).

Fill Type: 600 fill DriDown™

Natural down fill is “treated with a molecular level polymer, creating a hydrophobic finish on individual down plumes. The result: DriDown™ stays dry longer, lofts better, and dries faster than untreated down.”

To learn more about DriDown, click here.

Ethical sourcing of of down is a big concern for many consumers. Kelty utilizes the services of in order to determine where the down in their bags is sourced. It just so happens that the down in my bag, was sourced from a facility in Anhui, China utilizing grey duck down.

Style: Mummy

Mummy style sleeping bags are made to be more narrow around the shoulders and hips, but this can sometimes cause the bag to be restrictive and even uncomfortable. I got in the bag and found it to be rather spacious for a mummy style bag, giving more space to fidget and move.

Compression Size: 8 x 14 in / 20 x 36 cm*

Compression size can be a big deal when it comes to sleeping bags. The smaller the bag can compress, the less space it takes up in the backpack. The bag comes with it’s own compression bag which has a compression size of 8 x 14 in / 20 x 36 cm. I plan on using a different compression sack that decreases the compression size of the sleeping bag to 8 x 10 in.

Cost: $159.95 MSRP

For the weight, down fill, and temperature rating, this price is going to be very hard to beat with other bags out on the market.

Click here for specs and features and more photos

Initial Impressions:

With the combination of down fill, weight, compressibility, and temperature rating at a price-point of $159.95, this bag appears to be an incredible value at first  glance.

I plan on testing out the bag on a few backpacking trips over the next three months. Check back in about a month to see my next update on the Cosmic 20 sleeping bag.

Thanks to Kelty and 4AllOutdoors for the chance to review this bag.

Kaleb R.