Spark Sleeping Bag: 30F Down
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Ounce-trimming, crisp-night comfort with Spark Sleeping Bag: 30F Down
What Our Gearhead® Experts Are Saying:
"This is my go-to for late spring through early fall. It’s shockingly small in the pack and still cozy when temps flirt with freezing."
We keep pace with the Sea to Summit Spark 30F. Light, compressible down and efficient baffles deliver just-right warmth for alpine meadows, desert rims, and shoulder-season ridgelines. It packs smaller than a water bottle and is easy to live with from trailhead to summit.
Details
- 30-degree down sleeping bag for three-season backpacking
- High-loft fill balances warmth and minimal weight
- Efficient baffle layout limits cold spots
- Draft collar and zipper baffles help seal warmth
- Compresses exceptionally small to save pack space
- Ideal for alpine missions and long-mile days
- Item #STSZ0AC
- Responsible Collection
- Responsibly Sourced
- Material
- 10D nylon, DWR treatment
- Insulation
- 850-fill Ultra Dry goose down (RDS-certified)
- Shape
- mummy
- Zipper
- half-length
- Max User Height
- [regular] 72.8in, [long] 78in
- Shoulder Circumference
- [regular] 61in, [long] 65in
- Hip Circumference
- [regular] 53.1in, [long] 57.1in
- Foot Circumference
- [regular] 40.2in, [long] 44.1in
- Bag Length
- regular, long
- Draft Tube
- down-filled
- Fill Weight
- [regular] 9.3oz, [long] 10.8oz
- Degree
- 30F
- European Norm/ISO Comfort Rating
- 39F
- European Norm/ISO Lower Limit Rating
- 30F
- Stuff Size
- [regular] 8L, [long] 8L
- Claimed Weight
- [regular] 1lb 1.4oz, [long] 1lb 2.9oz
- Activity
- hike & camp
- Manufacturer Warranty
- limited lifetime
Reviews
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What do you think about this product?
Overall Rating
5 based on 45 ratings
Review Summary
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, and comfortable, high-quality materials. Many users find the bag roomy and easy to move in, despite its mummy-style shape. Overall, the product receives very positive reviews, with many customers highly recommending it.
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
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
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