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Sea To Summit
Spark SpII Sleeping Bag: 28F Down

4.631578947368421 out of 5 stars
152 Reviews

Out of Stock

Don't worry though, we have a lot more Down Sleeping Bags in stock than that.

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Why We Like The Spark SpII 28 Down Sleeping Bag

Ultralight and highly compressible, the Sea to Summit Spark SpII Sleeping Bag is one of our favorite recommendations for backpackers, racers, cyclists, and alpine climbers in search of a minimalist yet comfy night's sleep outside of doors.


Intent on making the lightest bag out there, Sea to Summit stuffed the Spark with 850-fill down for the best possible warmth-to-weight ratio. We love that this bag's nylon shell is windproof and prevents the down from breaking through, as well as the smooth nylon lining adding some durability. Going beyond an ultralight design, Sea to Summit added its Ultra-Dry Down treatment to help this bag resist moisture and enhance your comfort regardless of the conditions.




Details

  • Lightweight and compressible sleeping bag for alpine adventures
  • Contoured mummy shape is roomy yet maintains thermal efficiency
  • Ultra-Dry Down resists moisture for warm sleep in wet conditions
  • Lightweight nylon shell is highly compressible for easy packing
  • Vertical baffles in torso area boost warmth around your core
  • Horizontal baffles in lower body area minimizes the bag's weight
  • Draft tube prevents heat from escaping through the side zipper
  • Half-zip, 2-way zipper allows quick ventilation on warmer nights
  • Item #STS006Z
Material
[face fabric] 10D nylon, [lining] 7D nylon
Insulation
RDS 850+ Loft Premium Goose Ultra-Dry Down
Shape
contoured mummy
Zipper
half-length
Max User Height
[regular] 6ft, [long] 6ft 4in
Shoulder Circumference
[regular] 59in, [long] 62in
Hip Circumference
[regular] 51in, [long] 54in
Foot Circumference
[regular] 35in, [long] 58in
Bag Length
[regular] 6ft, [long] 6ft 4in
Draft Tube
yes
Pockets
none
Pad Retainer
none
Venting
two-way zipper
Fill Weight
[regular] 10.6oz, [long] 12.2oz
Degree
28F
European Norm/ISO Comfort Rating
35F
European Norm/ISO Lower Limit Rating
28F
Storage Sack
storage cell
Stuff Sack
Ultra-Sil compression bag
Stuff Size
[regular] 11 x 5in
Claimed Weight
[regular] 1lb 1.3oz, [long] 1lb 3.8oz
Activity
backpacking, mountaineering
Manufacturer Warranty
lifetime

Overall Rating

4.5 based on 152 ratings

Review Summary

1 Stars - 4 reviews
2 Stars - 2 reviews
3 Stars - 6 reviews
4 Stars - 22 reviews
5 Stars - 118 reviews

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.
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What do you think about this product?

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5 out of 5 stars

March 4, 2024

Great sleeping bag. Light weight,

[This review was collected as part of a promotion.] Great sleeping bag. Light weight, but warm. I used it this past weekend with the temp down to 31 degrees and was very comfortable. Highly recommend.

William J.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

March 4, 2024

Amazing sleeping bag

[This review was collected as part of a promotion.] Lightweight, down certification, great size. Loving the sleeping bag. Only down side is what happened to the big cotton storage sacks? Now it is a tiny plastic zip bag they give you that you have to stuff the bag into. That does not seem like a good storage sack that should let your sleeping bag breath and be fluffy. Bring them back! Disappointed that it no longer comes with the bag.

Pavla M.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

March 2, 2024

Very light bag. Yet roomy.

[This review was collected as part of a promotion.] Though I have not used the bag yet, I love how light it is and how small it compresses

Thomas M.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

March 2, 2024

Great Sleeping Bag

[This review was collected as part of a promotion.] Got this bag and immediately ended up on 2 campouts below freezing. Bag worked great and made me realize how my older bags are not as warm as they use to be. The storage bag and compression sack are very helpful for packing and storing the bag. The only flaw with this sleeping bag is that my kids love it and have claimed it for themselves, so I don't get to use it as often as I normally would.

Joseph H.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

February 11, 2024

Super lightweight and great quality

[This review was collected as part of a promotion.] The sleeping bag has really impressed me. Super lightweight, very small when packed into compression bag. Quality in every detail. The only cons, while understandable, is rather short zipper. Making it a bit longer would make it easier to get in and out

Volodymyr O.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

January 23, 2024

This sleeping bag is exactly

[This review was collected as part of a promotion.] This sleeping bag is exactly what I was looking for. Lightweight and perfect for cooler nights hunting in November and December. This will be used for bikepacking trips as well of course.

Kyle H.
Sea to Summit

Originally reviewed on Sea to Summit

4 out of 5 stars

January 8, 2024

Good bag, mediocre zipper?

[This review was collected as part of a promotion.] Zipper pull came out on the first use so returning it.

Vishal A.
Sea to Summit

Originally reviewed on Sea to Summit

2 out of 5 stars

January 5, 2024

Light but not great

I purchased the Spark 5 degree down bag and was excited at first. The bag weighed about an ounce less than the specifications, which was awesome until I looked closer. There is not enough down to have it spread out throughout the bag any any thickness. It has too many blank spots. Every time it is adjusted the down has to come from somewhere else. I suspect this bag was shorted on down. My other brand 25 degree bag is warmer. The zipper is very frustrating, it requires very specific angles to work and is very light duty, not much fun in the middle of the night. It is the wimpiest zipper I have ever seen on a sleeping bag. The bag is light and good to about 30 degrees compared to other bags.

Mike
Sea to Summit

Originally reviewed on Sea to Summit

4 out of 5 stars

December 29, 2023

Hard to beat the spark for ultralight!

[This review was collected as part of a promotion.] I really like the Spark Bag and it's weight is amazing. I'd give it five stars if it was just a bit roomier but i guess for an ultralight bag I shouldn't be expecting it to be roomier. I'd buy again.

Bradley D.
Sea to Summit

Originally reviewed on Sea to Summit

5 out of 5 stars

December 28, 2023

Love this bag. Warm and

[This review was collected as part of a promotion.] Love this bag. Warm and compact. Perfect for weight conscious trips.

Logan C.
Sea to Summit

Originally reviewed on Sea to Summit