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Sea To Summit
Spark Sleeping Bag: 15F Down

4.933333333333334 out of 5 stars
30 Reviews
$549.00 - $999.00
Color:Beluga Black



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.


  • 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
10D nylon, DWR treatment
850-fill Ultra Dry Down (RDS-certified)
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
Fill Weight
[regular] 1lb 0.9oz, [long] 1lb 3oz, [double] 2lb 2.7oz
European Norm/ISO Comfort Rating
European Norm/ISO Lower Limit Rating
Stuff Sack
Stuff Size
[regular] 13L, [long] 13L, [double] 20L
Claimed Weight
[regular] 1lb 9.75oz, [long] 1lb 11.7oz, [double] 3lb 6.4oz
hiking, camping, backpacking
Manufacturer Warranty
limited lifetime

Overall Rating

5 based on 30 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 2 reviews
5 Stars - 28 reviews

What do you think about this product?


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5 out of 5 stars

June 13, 2024

Absolutely incredible

[This review was collected as part of a promotion.] This weighs nothing at all. It's so amazing. I feel lucky to have this. It's crazy warm and soft and cozy. If I could sleep in it every night I would. I'm amazed by how warm this is with it weighing nothing at all.

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Originally reviewed on

5 out of 5 stars

June 10, 2024

Super Light Yet Warm

[This review was collected as part of a promotion.] It's a super comfortable, durable, and warm sleeping bag. I was impressed since it is super lightweight and easy to carry, especially with the bag it comes in. I do wish it was more compact, depise it being super lightweight, I feel like it takes up a lot of space.

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Originally reviewed on

5 out of 5 stars

June 10, 2024

Light & small, but performs great

[This review was collected as part of a promotion.] I am so impressed how light this sleeping bag is, but still keeps me warm! Compresses down without a problem - perfect companion for a backpacker/hiker. Love the attention to detail with the zipper - did not have any issues with snagging. Camped on a lake island with temps getting in the low 40s and still was comfortably warm. Material is easy to clean and shake out. 10/10 recommend.

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Originally reviewed on

5 out of 5 stars

May 23, 2024

Good sleeping bag

[This review was collected as part of a promotion.] This sleeping bag is spacious and I love that it has a long zipper that make it easy to get in and out. It’s light weight and keep me warm in the cold weather.

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Originally reviewed on

5 out of 5 stars

May 20, 2024

So comfy and warm

[This review was collected as part of a promotion.] This is definitely an investment in a quality sleeping bag for camping. The down material keeps you warm and snugged in temperatures that can drop overnight. It can me packed up nicely, lightweight and does not take up much space. It is very roomy, I am petite, female and 160 lbs, it zips up easily and does not snag. It is like cocoon shaped and air does not good to keep you warm. I amazed by the quality and craftsmanship. It is extremely soft and so comfortable. You have to remember the key is quality, comfort, comfort and warmth. In addition to being light weight so you can transport easily.

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Originally reviewed on

5 out of 5 stars

May 19, 2024

Sleep tight

[This review was collected as part of a promotion.] Packed in, sleeping bag and all. It always amazes me that something that keep you warm can fit inside a backpack like this. Thankful for this design.

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Originally reviewed on

5 out of 5 stars

May 4, 2024

Great sleeping bag!

[This review was collected as part of a promotion.] I received this product for free from influenster in exchange for my honest review. This sleeping bag is very well insulated, easy to pack, extremely comfortable and durable. It is also unisex so it is suitable for men or women. I would for sure recommend it to others, especially if you need to keep warm!

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Originally reviewed on

5 out of 5 stars

May 2, 2024

Most Luxurious, Comfortable, Lightweight Material I Have Ever Felt!

[This review was collected as part of a promotion.] As an avid hiker/backpacker, I have been wanting a sleeping bag that is super light to not weigh me down and small enough to not add too much bulk on my back. I have only heard good things from the Sea to Summit brand, so I was excited to try the 30-degree Spark Down Sleeping Bag. It came with a storage bag, a smaller compression bag, a clip, and a down certification paper with tons of interesting information about the down filling. It's amazing how compressed this sleeping bag can get, and it is so super lightweight! It didn't feel like any added weight at all when attached to my backpack! It zips down about halfway, so I had plenty of room to get in it. The zipper is smooth and seems very high quality. It is a mummy style bag, so it's meant to be snug in the footboard area. However, I had plenty of room for my feet and legs to move around. I was afraid it would feel too restrictive for my liking, but that wasn't the case at all. I could move my legs to be about shoulder width apart. The hood cinches, which helps with warmth as well. For context, I am a 5 ft 5 in female that weighs 135 pounds, so I can see this working for a variety of people given how much extra room I had. As far as comfort, I can't even describe how pleasant this bag feels. My words when I first got in was, "Wow, this feels like liquid gold surrounding my body!" That's the only words that came to mind, but it's the best feeling material I have ever felt! It's truly amazing and makes me want to use it in my bed every night! Even though it's extremely soft, it also seems like a high-quality shell that will withstand several seasons of camping. As far as warmth, I took it outside on a cold night, about 35 degrees, just to test it out. I was still warm after quite a few minutes, so I think the 30-degree rating is spot on. Overall, I am extremely happy with this sleeping bag and totally recommend it to anyone looking to prioritize comfort, warmth, and lightweight material!

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Originally reviewed on

5 out of 5 stars

April 29, 2024

Snug as a bug!

[This review was collected as part of a promotion.] Comfortable, warm and like a cocoon for you. Keeps you warm and also the lightweight material and stuffing keep you comfortable and not overheating.

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Originally reviewed on

5 out of 5 stars

April 27, 2024

Fantastic and light weight!

[This review was collected as part of a promotion.] Wow! Blown away by how light this is! It folds down super small if you use the compression bag it comes with or the regular uncompressed back for normal storage. It’s a decent roomy size for a mummy bag that fit both myself and husband just fine without feeling too tight. The no snag zipper is a nice bonus feature along with the ability to synch in the hood/top part. The outer material is thin but has a coating on it that makes it more durable than expected. It warmed up quickly with body heat and I have no concerns about being cold within the approved temperature range. Would recommend and excited to get more use of this as camping season picks back up!


Originally reviewed on