Spark Sleeping Bag: 15F Down
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Why We Like The Sea To Summit Spark 15F Down Sleeping Bag
Jumpstart your spring camping with the Sea To Summit Spark 15F Down Sleeping Bag. Coming in under two pounds, the Spark fits easily into our bag for early springtime expeditions skiing to backcountry yurts and late fall trips to stunning vistas where we can watch the leaves change color. The warm 850-fill down is treated with an Ultra Dry treatment to maintain loft in damp conditions, and a DWR treatment sheds condensation in our tent so we can sleep comfortably through the night.
Details
- Lightweight 15-degree sleeping bag for shoulder season camping
- 850-fill hydrophobic down is reliably warm in wet and cold conditions
- Nylon shell is light and packable to save our backs on long hikes in
- DWR treatment sheds moisture to ensure down stays lofty and warm
- Mummy shape maximizes thermal retention with a low-weight
- Draft collar seals out cold air for a comfortable night of rest
- Adjustable hood wraps around our head to maximize warmth
- Compressible nylon and lightweight down pack down small
- 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 43 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 widely praised for its excellent performance and quality. Customers highlight its lightweight and compact design, exceptional warmth and insulation, soft and comfortable material, and roomy yet mummy-style fit that allows for easy movement. Many users are highly satisfied with the overall value and say they would recommend the product.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageJuly 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
December 14, 2024
Warranty exchange
[This review was collected as part of a promotion.] Had an issue with a sleeping bag after washing it cause if stuffing to move quite a lot
Originally reviewed on Sea to Summit
December 7, 2024
Failed gear and constantly getting frustrated
[This review was collected as part of a promotion.] 30% off after I buy it. And everything we have purchased has failed or ripped in two outings No more seatotrash for our family.
Originally reviewed on Sea to Summit
November 5, 2024
Almost perfect
[This review was collected as part of a promotion.] I really like the compressibility and weight of this bag. Just what I need for the fall and spring in my area. My only complaint is that the zipper is on the left, which I can't get used to. The door of my Alto TR1 is on the right (as well as most other single door tents) and so is the storage pocket. I am used to being able to unzip the bag a bit and access the door of my tent and the pocket for my phone ect. I can still get to these things but I would prefer the zipper on the right like all my other sleeping bags.
Originally reviewed on Sea to Summit
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