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Sea To Summit
Spark Sleeping Bag: 30F Down

4.777777777777778 out of 5 stars
45 Reviews
Current price: $336.75 - $359.25 Original price: $479.00
25% off
Color:Beluga Black

Size:

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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

What do you think about this product?

Overall Rating

5 based on 45 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 4 reviews
5 Stars - 39 reviews

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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5 out of 5 stars

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)!

Kit P.
Sea to Summit

Originally reviewed on Sea to Summit

4 out of 5 stars

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.

user image
Aaron T.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

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

Jessica W.
Sea to Summit

Originally reviewed on Sea to Summit

3 out of 5 stars

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.

patricia g.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

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.

Aaron W.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

May 26, 2025

very good

[This review was collected as part of a promotion.] The sleeping bag is very comfortable and works great.

kaijun x.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

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.

paula l.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

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.

Ben G.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

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.

Gary L.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

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

Mike B.
Sea to Summit

Originally reviewed on Sea to Summit

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