Kelty Mistral 40 vs TETON Sports Altos Down 0°F

Editorial Team
Last modified at July 31, 2026
When it comes to choosing a budget sleeping bag, comfort and durability are often at the forefront of a buyer's mind. The Kelty Mistral 40 and the TETON Sports Altos Down 0°F are two popular options that cater to different needs. The Mistral 40 is known for its exceptional comfort and warmth, while the Altos Down 0°F stands out for its packability and durability.

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Kelty Mistral 40TETON Sports Altos Down 0°F
Mistral 40
Altos Down 0°F
Fill Type

CloudLoft synthetic

MtnDry down

Weight

44 oz

72 oz

Size

Regular: 76 in long

84 × 33 in

Shell Material

190T polyester taffeta

Nylon

Compression Sack

Included

Included; 15.5 × 9.5 × 9.5 in packed

Warranty

Limited lifetime

Limited lifetime

Lining Material

190T polyester taffeta

20D 380T nylon

Baffle Construction

Offset quilted

Not specified

Color

Green

Black

Draft Tubes

Draft-locked zipper

Full-length zipper draft tube

Fill Power

Not applicable - synthetic fill

Not specified

Foot Box

Natural-fit spacious footbox

Mummy

Comfort

Mistral 40

4.6/ 5.0

Altos Down 0°F

2.9/ 5.0

Comfort is a crucial factor when selecting a sleeping bag, as it directly impacts the quality of your rest. A comfortable sleeping bag can make the difference between a restful night and a tossing, turning experience. The Kelty Mistral 40 shines in this category with its spacious natural fit foot box, full hooded draft tube, and women's specific cut, all contributing to a cozy and comfortable sleep environment. Users consistently praise its comfort and comfort hood, making it a top choice for those who prioritize a good night's sleep. In contrast, the TETON Sports Altos Down 0°F receives mixed reviews on comfort. While some users find it cozy and warm, others report issues with fit and feel, indicating that it may not be the best choice for those who prioritize comfort above all else.

Durability

Mistral 40

3.6/ 5.0

Altos Down 0°F

3.9/ 5.0

Durability is essential for a sleeping bag, especially if you plan to use it frequently or in rugged conditions. A durable sleeping bag can withstand the wear and tear of outdoor adventures, ensuring it lasts for many trips to come. The TETON Sports Altos Down 0°F excels in this category with its durable material and construction, making it a reliable option for outdoor activities. Users praise its sturdy build, which can handle various conditions. The Kelty Mistral 40, while also durable, has fewer mentions of its durability, indicating that it might not be as robust as the Altos Down 0°F.

Warmth

Mistral 40

4.4/ 5.0

Altos Down 0°F

3.9/ 5.0

Warmth is a key consideration for any sleeping bag, as it determines how well the bag can keep you warm in cold conditions. A warm sleeping bag is crucial for a comfortable night's sleep, especially in chilly environments. The Kelty Mistral 40 is highly praised for its warmth, with users noting its ability to keep them warm in temperatures as low as 20° Fahrenheit. Its cozy CloudLoft synthetic insulation and offset quilt construction help prevent cold spots, making it an excellent choice for cold weather. The TETON Sports Altos Down 0°F also receives positive feedback on its warmth and insulation, but some users report it may not be sufficient for extremely cold conditions, making the Mistral 40 a better option for those seeking reliable warmth.

Packability

Mistral 40

4.1/ 5.0

Altos Down 0°F

4.3/ 5.0

Packability is important for those who need to carry their sleeping bag on long hikes or backpacking trips. A packable sleeping bag can be easily compressed and carried, saving valuable space in your backpack. The TETON Sports Altos Down 0°F excels in this category with its lightweight design and compact stuff sack, making it easy to transport. Users appreciate its packability, which is crucial for multi-day trips. The Kelty Mistral 40 also offers good packability with its included compression sack, but it is slightly heavier, making the Altos Down 0°F a better choice for those prioritizing easy transport.

Ease Of Use

Mistral 40

4.1/ 5.0

Altos Down 0°F

3.1/ 5.0

Ease of use is an important factor, especially for those who want a hassle-free experience when setting up their sleeping bag. A user-friendly sleeping bag can save time and effort, allowing you to focus on enjoying your outdoor adventure. The Kelty Mistral 40 is praised for its non-snag zipper and dual slide snag-free locking zippers, making it easy to use. Users find it convenient and hassle-free, which is a significant advantage for those who value ease of use. The TETON Sports Altos Down 0°F, on the other hand, has mixed reviews on ease of use, with some users finding the zipper and drawstrings easy to use while others report difficulties, making the Mistral 40 a better choice for those seeking a user-friendly option.

Versatility

Mistral 40

4.1/ 5.0

Altos Down 0°F

4.2/ 5.0

Versatility is important for those who need a sleeping bag that can adapt to different conditions and preferences. A versatile sleeping bag can be used in various environments and seasons, making it a valuable investment. Both the Kelty Mistral 40 and the TETON Sports Altos Down 0°F offer good versatility, but in different ways. The Mistral 40 provides dual slide snag-free locking zippers for venting versatility and is suitable for summer, spring, and autumn. The Altos Down 0°F offers various size and color options, making it adaptable to different needs and preferences. This category is a tie, as both sleeping bags offer unique versatility features that cater to different user needs.

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Conclusion & Final Verdict:

In conclusion, the Kelty Mistral 40 is the better choice for those prioritizing comfort and warmth. Its spacious design, excellent insulation, and user-friendly features make it ideal for a cozy night's sleep in various conditions. On the other hand, the TETON Sports Altos Down 0°F is suited for those who need a durable and packable sleeping bag for rugged outdoor adventures. While it may not be as comfortable, its robust build and lightweight design make it a reliable option for frequent travelers and backpackers.

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