Kelty Mistral 40 vs Kelty Cosmic Down 20

Editorial Team
Last modified at July 31, 2026
When it comes to choosing a budget sleeping bag, the Kelty Mistral 40 and the Kelty Cosmic Down 20 are two popular options. Both offer unique features that cater to different needs and preferences. This comparison will help you understand the strengths and weaknesses of each product, making it easier to decide which one is right for you.

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Kelty Mistral 40Kelty Cosmic Down 20
Mistral 40
Cosmic Down 20
Fill Type

CloudLoft synthetic

550-fill down

Weight

44 oz

Regular: 39 oz

Size

Regular: 76 in long

Regular: 78 in long

Shell Material

190T polyester taffeta

Recycled 20D nylon taffeta

Compression Sack

Included

Included; Regular: 8 × 13 in

Warranty

Limited lifetime

Limited lifetime

Lining Material

190T polyester taffeta

Recycled 50D polyester taffeta

Baffle Construction

Offset quilted

Trapezoidal baffles

Color

Green

Not specified

Draft Tubes

Draft-locked zipper

Full draft tube and collar

Fill Power

Not applicable - synthetic fill

550 fill

Foot Box

Natural-fit spacious footbox

Natural-fit footbox

Comfort

Mistral 40

4.6/ 5.0

Cosmic Down 20

4.2/ 5.0

Comfort is crucial for a good night's sleep, especially when you're out in the wilderness. A comfortable sleeping bag can make a significant difference in your overall camping experience. The Kelty Mistral 40 excels in this category with its spacious natural fit foot box, full hooded draft tube, and women's specific cut, which are designed to provide a cozy and unrestricted sleeping environment. Buyers consistently praise its comfort and comfort hood, making it a standout choice for those who prioritize a restful sleep. While the Kelty Cosmic Down 20 also receives positive feedback for comfort, it lacks the additional features that make the Mistral 40 more comfortable.

Durability

Mistral 40

3.6/ 5.0

Cosmic Down 20

4.4/ 5.0

Durability ensures that your sleeping bag can withstand the rigors of outdoor use and last for many camping trips. A durable sleeping bag is an investment that pays off in the long run. The Kelty Cosmic Down 20 shines in this category with its high-quality materials and construction, receiving consistent praise for its durability. The Mistral 40, while durable, has fewer mentions of its durability, making the Cosmic Down 20 the better choice for those looking for a long-lasting sleeping bag.

Warmth

Mistral 40

4.4/ 5.0

Cosmic Down 20

4.7/ 5.0

Warmth is essential for staying comfortable in cold weather conditions. A warm sleeping bag can make the difference between a pleasant night and a miserable one. The Kelty Cosmic Down 20 is rated higher for warmth, with buyers praising its ability to keep them warm in temperatures as low as 20°F. The Mistral 40 also provides good warmth but has a few complaints that keep it from being flawless. If warmth is a top priority, the Cosmic Down 20 is the better choice.

Packability

Mistral 40

4.1/ 5.0

Cosmic Down 20

4.1/ 5.0

Packability is important for campers who need to save space in their backpacks. A compact sleeping bag is easier to carry and store. Both the Kelty Mistral 40 and the Kelty Cosmic Down 20 score equally in this category, with positive feedback on their included compression sacks and compact sizes. This makes it a tie, as both products offer similar advantages in terms of packability.

Ease Of Use

Mistral 40

4.1/ 5.0

Cosmic Down 20

3.1/ 5.0

Ease of use can greatly enhance your camping experience, making it simpler to set up and pack away your sleeping bag. The Kelty Mistral 40 stands out with its non-snag zipper and dual slide snag-free locking zippers, which make it easier to use. The Cosmic Down 20, on the other hand, lacks sufficient feedback in this area, making the Mistral 40 the clear winner for ease of use.

Versatility

Mistral 40

4.1/ 5.0

Cosmic Down 20

3.1/ 5.0

Versatility allows a sleeping bag to be used in a variety of conditions and seasons, making it a more flexible option for different camping scenarios. The Kelty Mistral 40 offers better versatility with its dual slide snag-free locking zippers that provide venting options, making it suitable for different weather conditions. The Cosmic Down 20 lacks detailed feedback in this area, making the Mistral 40 the better choice for those seeking a versatile sleeping bag.

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Conclusion & Final Verdict:

In conclusion, the Kelty Mistral 40 and the Kelty Cosmic Down 20 each have their strengths and weaknesses. The Mistral 40 excels in comfort, ease of use, and versatility, making it a great choice for those who prioritize a comfortable and user-friendly sleeping bag. On the other hand, the Cosmic Down 20 stands out in durability and warmth, making it ideal for those who need a long-lasting and warm sleeping bag. Depending on your specific needs and preferences, either of these sleeping bags could be the right choice for you.

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