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
Q&A
What do you think about this product?
Overall Rating
5 based on 48 ratings
Review Summary
Customer Images
Here's what customers have to say
The Spark 15F down sleeping bag is praised for its exceptional warmth, comfort, and lightweight design. Users report the bag keeps them warm even in cold temperatures and compresses down to a small size. Reviewers highlight the high-quality materials, including the 850+ fill power goose down and the non-PFC Ultra-Dry Down treatment, which contribute to the bag's warmth and durability. Overall, the sleeping bag is described as an impressive, ultra-lightweight option that is warm and comfortable for camping and outdoor activities.
AI-generated from the text of customer reviews.
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Selecting an option will reload the available reviews on the pageOctober 7, 2025
Super warm and light
[This review was collected as part of a promotion.] This thing is so cozy and I loved the footroom and fabric that repels moist
Originally reviewed on Sea to Summit
October 5, 2025
I love this product!
[This review was collected as part of a promotion.] Truly a best in class sleeping bag for backpacking, I love it! Retains body heat well, great product!
Originally reviewed on Sea to Summit
September 12, 2025
Took the Spark Down to
[This review was collected as part of a promotion.] Took the Spark Down to the woods on a Canada trip- loved the light weight, compaction of the bag. Stayed warm throughout the night. Had some rain get in the tent, the bag dried out extremely quick. The bag is soft and comfortable, really like how it's not overly heavy and still retains it's loft. I need equipment that is light, durable, and quality. I don't want to be out in wild, miles from anything and be wet, cold, and miserable with bad gear. Very happy with the product!
Originally reviewed on Sea to Summit
August 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
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