Spark Pro Sleeping Bag: 15F Down
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Quantity
Only 2 In stock
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Expedition-light warmth that packs tiny in Spark Pro Sleeping Bag: 15F Down
What Our Gearhead® Experts Are Saying:
"Serious warmth for its weight. The down loft is impressive, and it still compresses into a true ‘small’ in my pack."
We chase shoulder-season summits with the Sea to Summit Spark Pro 15F. High-loft down, heat-trapping baffles, and a streamlined cut boost warmth without taxing pack space.Draft-blocking details and a cozy hood help seal the deal when mountain nights bite.
Details
- 15-degree down bag tuned for cold, fast-and-light missions
- High-loft down and efficient baffles trap heat
- Lightweight shell fabrics keep weight low
- Draft collar and zipper baffles reduce heat loss
- Compresses small for alpine packs and long approaches
- Ideal for shoulder-season and light winter objectives
- Item #STSZ0A7
- Responsible Collection
- Responsibly Sourced
- Material
- [face fabric] 10D nylon, [hood, footbox] PFC-free DWR treatment
- Insulation
- 950 fill RDS-certified goose down, Ultra Dry Down treatment
- Shape
- mummy
- Zipper
- full-length
- Max User Height
- [regular] 73.8in, [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
- Venting
- Free Flow Zip System (1/4-length secondary zip, zippered footbox)
- Fill Weight
- [regular] 1lb 0.9oz, [long] 1lb 1.8oz
- Degree
- 15F
- European Norm/ISO Comfort Rating
- 29F
- European Norm/ISO Lower Limit Rating
- 18F
- Stuff Sack
- included
- Stuff Size
- 13L
- Claimed Weight
- [regular] 1lb 11.7oz, [long] 1lb 14.4oz
- Activity
- weekend camping, backpacking
- Manufacturer Warranty
- lifetime
Reviews
Q&A
What do you think about this product?
Overall Rating
4.5 based on 18 ratings
Review Summary
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.Customer Images
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Selecting an option will reload the available reviews on the pageOctober 25, 2025
Better than expected
[This review was collected as part of a promotion.] This 15 degree, Spark Pro Down sleeping bag, performed extremely well at 27 to 30 degree temperatures and I needed no other accessories to stay worm and comfortable. (Primitive camping for a week) I'm 6'0" tall and the "long" bag was the perfect size for me. It truly exceeded my expectations and I would buy it again. Buy once, cry once but well worth the purchase. -JR
Originally reviewed on Sea to Summit
October 11, 2025
Impressive bag!
[This review was collected as part of a promotion.] Super lightweight, feels great against your skin, mummy shape, but not too restrictive, quality workmanship, stuffs down super small when using compression straps. The feature to "wear" the bag with your arms and feet out are especially useful on a chilly night or morning! I have not had it long, but I would definitely recommend it so far.
Originally reviewed on Sea to Summit
July 11, 2025
Best sleeping bag I’ve ever owned
[This review was collected as part of a promotion.] Packs down very small and all the different zippers / venting options makes this bag extremely versatile, absolutely love the fact it can fully unzip into a cozy down blanket.
Originally reviewed on Sea to Summit
June 5, 2025
Disappointed – Got Used Items Twice
- Familiarity:
- I returned this product before using it
I ordered this sleeping bag twice. The first one had a strong odor that made it unusable. The second one was clearly used — no tags, stains, and missing the carabiner. Backcountry didn’t offer a replacement, just a refund. I expected much better when spending $500 on a premium product. Definitely not ordering from them again.
April 21, 2025
Extremely warm, being able to
[This review was collected as part of a promotion.] Extremely warm, being able to unzip feet is awesome!
Originally reviewed on Sea to Summit
January 22, 2025
Great Sleeping Bag
[This review was collected as part of a promotion.] I really like that I can open the foot box when it’s warm out. This allows me to sleep more comfortably in a wider range of temperatures
Originally reviewed on Sea to Summit
October 11, 2024
Perfect kit addition
[This review was collected as part of a promotion.] This liner is always with me, if I am not using to stay extra toasty in my bag, I use it as a pad sheet for sleeping on during the hot desert nights. Absolute must have for any serious outdoors person
Originally reviewed on Sea to Summit
October 1, 2024
Sea to summit Spark Down zero degree sleeping bag
[This review was collected as part of a promotion.] Best purchase ever! I bought this for the COLD fall nights backpacking in Glacier Park, and it did not disappoint. Keeps me toasty warm. I love the light weight, and it packs down fairly small. The baffles and extra down in the hood are great touches. Would 100 percent recommend this sleeping bag.
Originally reviewed on Sea to Summit
July 19, 2024
so soft and warm
[This review was collected as part of a promotion.] I haven't taken this bag out yet but I've tested it at home and it's feather-light and so comfortable. We're going backpacking this weekend and I'll report back.
Originally reviewed on Sea to Summit
June 13, 2024
High Quality, Lightweight
[This review was collected as part of a promotion.] This sleeping bag has just about every feature you could wish for. You can unzip the arm area, the foot area, and fully unzip it to use as a blanket. You can even zip two bags together! It cinches up around the head and neck area to keep in maximum warmth. It’s also filled with goose down, allowing it to be both breathable and incredibly warm. What I’m still blown away by is the weight- it comes it at under 2 lbs and compresses down into a very small pack. This is perfect for overnight hikes where every ounce matters. I’m so excited to bring this along for cold weather camping!
Originally reviewed on influenster.com
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