Spark Sleeping Bag: 15F Down
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Ultralight cold-night confidence with Spark Sleeping Bag: 15F Down
What Our Gearhead® Experts Are Saying:
"Warmth-to-weight is stellar. It compresses to a true ‘small’ and still handles frosty starts."
We chase shoulder-season summits with the Spark 15F Down. High-loft fill, efficient baffles, and a streamlined cut deliver serious warmth without taxing pack space.Draft controls fine-tune comfort when temps hover well below freezing—ideal for fast, cold itineraries.
Details
- Ultralight sleeping bag for alpine missions and cold-weather backpacking
- 15-degree rating ideal for early spring and late fall expeditions
- Premium 850+ fill down offers high warmth-to-weight ratio
- Ultralight 10D shell fabric minimizes packed weight and size
- Tapered mummy shape reduces dead space and boosts thermal efficiency
- Draft collar and zipper guard keep warmth inside and cold out
- Full-length zipper allows ventilation when conditions warm up
- Compresses extremely small for efficient pack storage
- Item #STSZ0AA
- Responsible Collection
- Responsibly Sourced
- Material
- 10D nylon, DWR treatment
- Insulation
- 850-fill Ultra Dry Down (RDS-certified)
- Shape
- mummy
- Max User Height
- [regular] 72.8in, [long] 78in, [double] 78in
- Shoulder Circumference
- [regular] 61in, [long] 65in, [double] 105.5in
- Hip Circumference
- [regular] 53.1in, [long] 57.1in, [double] 96.9in
- Foot Circumference
- [regular] 40.2in, [long] 44.1in, [double] 82.3in
- Bag Length
- regular, long, double
- Draft Tube
- full-length
- Fill Weight
- [regular] 1lb 0.9oz, [long] 1lb 3oz, [double] 2lb 2.7oz
- Degree
- 15F
- European Norm/ISO Comfort Rating
- 29F
- European Norm/ISO Lower Limit Rating
- 18F
- Stuff Sack
- included
- Stuff Size
- [regular] 13L, [long] 13L, [double] 20L
- Claimed Weight
- [regular] 1lb 9.75oz, [long] 1lb 11.7oz, [double] 3lb 6.4oz
- Activity
- hiking, camping, backpacking
- Manufacturer Warranty
- limited lifetime
Reviews
Q&A
What do you think about this product?
Overall Rating
5 based on 46 ratings
Review Summary
Fits True To Size
Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.Customer Images
Here's what customers have to say
The sleeping bag is well-suited for camping and outdoor activities, with reviewers praising its warmth, comfort, and lightweight design. It is rated for 0 degrees Fahrenheit and made of high-quality, soft, and durable materials that provide a snug and cozy fit while allowing for easy movement. The bag is also highly compressible and easy to pack, making it a good choice for backpacking and hiking. Overall, the product is well-received for its quality, functionality, and value.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageAugust 25, 2025
Perfect Summer Bag
[This review was collected as part of a promotion.] Had this bag with me on an 8-day bikepacking trip round the Pacific Northwest. Light, packs small, and functions as you’d expect (no zipper snags)!
Originally reviewed on Sea to Summit
August 19, 2025
Overall great warmth/weight ratio
[This review was collected as part of a promotion.] Over three months I've taken this bag camping on the Alaska Marine Highway (ferry) and a couple 1-3 nighters in the Cascades. It's not the warmest bag you'll find, and on a cold night in the mountains (in a 3-season tent), I was a little bit cold -- though not uncomfortably so. However, it's a great compromise on warmth/weight -- and especially warmth/volume. It packs up so small, best part. The half zip is a little annoying, but I understand the compromise.
Originally reviewed on Sea to Summit
August 7, 2025
Spark 15f regular
[This review was collected as part of a promotion.] Amazing bag super compact and light and met all temp expectations
Originally reviewed on Sea to Summit
July 7, 2025
Spark bag
[This review was collected as part of a promotion.] Do not like 3/4 zipper. Makes bag difficult to get in out. Do appreciate the lightness of the bag.
Originally reviewed on Sea to Summit
June 15, 2025
Spark down sleeping bag
[This review was collected as part of a promotion.] I plurchased this for a fast thru hike on the Superior Hiking Trail. Nights got down to 40 degrees. I-was a little worried about the chill and the bag rating since I'm a t-shirt underwear and sometimes socks guy. But this was perfect. Finally a bag true to its rating. Yes my tent was small and my pad reflects heat as well. but the bag was warm and comfortable and packs down sooo crazy tiny.
Originally reviewed on Sea to Summit
May 26, 2025
very good
[This review was collected as part of a promotion.] The sleeping bag is very comfortable and works great.
Originally reviewed on Sea to Summit
April 10, 2025
It is for my husband.
[This review was collected as part of a promotion.] It is for my husband. He loves it for his backpacking trip.
Originally reviewed on Sea to Summit
March 23, 2025
Elbow room
- Familiarity:
- I've used it several times
I feel that the bag felt bigger than spec on the inside which I’ve been looking for
February 18, 2025
Best zero degree bag on the market
[This review was collected as part of a promotion.] I have just got mine and slept in it for five nights total. Comfortable and spacious and incredibly warm. 2Lbs 7Oz. is really good for a zero degree bag and keeps me going for four seasons.
Originally reviewed on Sea to Summit
January 13, 2025
Great Sleeping Bag
[This review was collected as part of a promotion.] Great design and functionality. Bag easily meets or exceeds the temperature rating.
Originally reviewed on Sea to Summit
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