Kelty Cosmic Down 20 Sleeping Bag vs Mountain Hardwear Bishop Pass 15 Sleeping Bag

Editorial Team
Last modified at May 24, 2026
When it comes to backpacking, a good night's sleep is essential for an enjoyable trip. The Kelty Cosmic Down 20 Sleeping Bag and the Mountain Hardwear Bishop Pass 15 Sleeping Bag are both popular choices among outdoor enthusiasts. This comparison will help you understand the strengths and weaknesses of each, ensuring you make an informed decision based on your specific needs.

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Kelty Cosmic Down 20 Sleeping BagMountain Hardwear Bishop Pass 15 Sleeping Bag
Cosmic Down 20 Sleeping BagMountain Hardwear Bishop Pass 15 Sleeping Bag
Weight

Short: 35 oz Regular: 43 oz Long: 47 oz

Regular: 2 lb 5.4 oz / 1060 g

Fill Power

550

650

Packed Size

Short: 1029 cu in Regular: 1352 cu in Long: 1512 cu in

Stuffed: 15.5 x 8 in / 39 x 20.25 cm; compressed volume Regular: 494 in³ / 8.1 L

Shell Material

Recycled 20D Nylon Taffeta

20D ripstop nylon, DWR finish

Fits Up To Height

Short: 72 in Regular: 78 in Long: 84 in

Regular: 72 in / 183 cm; Long: 78 in / 198 cm

Warranty

Lifetime

Limited lifetime warranty for practical life of product

Zipper Type

Quad-stitch anti-snag

Two-way zipper with draft guard

Down Treatment

DriDown

Fluorine-free

Baffle Construction

Trapezoidal

Full-length down draft tube; manufacturer does not list a separate baffle construction spec

Foot Box Shape

Expanded, natural fit

Contoured

Hood Type

Insulated, adjustable

Performance Plus Mummy cut with shaped draft collar and adjustable down-filled face gasket

Water Resistance

PFAS-free DWR

DWR finish

Draft Collar

Full draft tube and collar

Shaped draft collar with adjustable down-filled face gasket

Temperature Rating

20°F

15°F / -9°C

Comfort

Cosmic Down 20 Sleeping Bag

4.2/ 5.0

Mountain Hardwear Bishop Pass 15 Sleeping Bag

3.9/ 5.0

Comfort is crucial for a good night's sleep, especially after a long day of backpacking. A comfortable sleeping bag can make a significant difference in your overall outdoor experience. The Kelty Cosmic Down 20 offers a cozy and roomy fit, with many users appreciating the comfortable design and ample leg room. However, some may find the shoulder area a bit tight. On the other hand, the Mountain Hardwear Bishop Pass provides a cozy fit that side sleepers appreciate, with features like a draft collar for temperature regulation, though some may find it slightly restrictive. Overall, the Cosmic Down 20 edges out the Bishop Pass in comfort due to its higher rating and more positive user feedback.

Warmth

Cosmic Down 20 Sleeping Bag

4.8/ 5.0

Mountain Hardwear Bishop Pass 15 Sleeping Bag

3.9/ 5.0

Warmth is a critical factor for backpacking sleeping bags, as it directly impacts your comfort and safety in cold conditions. The Kelty Cosmic Down 20 is highly praised for its warmth, keeping users comfortable in cold conditions down to 30 degrees. It has a higher warmth rating and more positive user feedback compared to the Bishop Pass. The Mountain Hardwear Bishop Pass, with a 15°F rating and an extra layer of down, retains heat well in cold conditions, though a few users found it too warm for milder nights. The Cosmic Down 20's superior warmth makes it the better choice for colder environments.

Durability

Cosmic Down 20 Sleeping Bag

4.9/ 5.0

Mountain Hardwear Bishop Pass 15 Sleeping Bag

4.2/ 5.0

Durability ensures that your sleeping bag can withstand the rigors of the trail and last for many trips. The Kelty Cosmic Down 20 is noted for its high-quality materials and construction, ensuring long-lasting durability. It has a higher durability rating and more positive user feedback. The Mountain Hardwear Bishop Pass also offers strong abrasion resistance with its 20D nylon shell and DWR coating, along with a snag-free zipper. However, the Cosmic Down 20's superior durability rating makes it the more reliable choice for long-term use.

Packability

Cosmic Down 20 Sleeping Bag

4.4/ 5.0

Mountain Hardwear Bishop Pass 15 Sleeping Bag

3.8/ 5.0

Packability is important for backpackers who need to save space and weight in their packs. The Kelty Cosmic Down 20 is appreciated for its lightweight and compact design, making it easy to pack and carry on backpacking trips. It has a higher packability rating and more positive user feedback. The Mountain Hardwear Bishop Pass compresses down to a compact size for easy packing, though it may not be as small as some 30°F bags. The Cosmic Down 20's superior packability makes it the better choice for those prioritizing space and weight savings.

Versatility

Cosmic Down 20 Sleeping Bag

3.1/ 5.0

Mountain Hardwear Bishop Pass 15 Sleeping Bag

4.4/ 5.0

Versatility allows a sleeping bag to adapt to varying conditions, making it suitable for a range of environments. The Mountain Hardwear Bishop Pass adapts well to varying conditions with vented gills and the ability to unzip fully, making it a great choice for technical users. It has a higher versatility rating and more positive user feedback. The Kelty Cosmic Down 20's versatility is less documented, with buyer feedback not providing enough detail to treat it as a standout benefit. The Bishop Pass's superior versatility makes it the better choice for those needing adaptability in different conditions.

Ease Of Use

Cosmic Down 20 Sleeping Bag

3.7/ 5.0

Mountain Hardwear Bishop Pass 15 Sleeping Bag

3.2/ 5.0

Ease of use ensures that you can quickly and conveniently set up and adjust your sleeping bag. The Kelty Cosmic Down 20 is found easy to use, with features like a two-way zipper and velcro closure enhancing convenience. It has a higher ease of use rating and more positive user feedback. The Mountain Hardwear Bishop Pass's two-way zipper and venting options make adjustments easy, though some users found it less intuitive to use. The Cosmic Down 20's superior ease of use makes it the better choice for those prioritizing convenience.

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Conclusion & Final Verdict:

After comparing the Kelty Cosmic Down 20 and the Mountain Hardwear Bishop Pass 15, it's clear that both sleeping bags have their strengths. The Kelty Cosmic Down 20 excels in comfort, warmth, durability, packability, and ease of use, making it a great choice for those prioritizing these features. On the other hand, the Mountain Hardwear Bishop Pass 15 stands out in versatility and has a slightly better temperature rating, making it suitable for a range of conditions.

Choose the Kelty Cosmic Down 20 if you need a warm, durable, and comfortable sleeping bag that packs down small. Opt for the Mountain Hardwear Bishop Pass 15 if you need a versatile sleeping bag that can adapt to varying conditions.

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