Spark Pro Sleeping Bag: 15F Down
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Quantity
Only 1 In stock
Why We Like The Sea To Summit Spark Pro Sleeping Bag
The Sea To Summit Spark Pro Sleeping Bag takes lightweight warmth to the next level, cutting weight from our back and packing down small for our pack. The incredible 950-fill down is light and lofty, trapping heat close to our bodies for chilly spring and fall camping trips. The Free Flow zip system makes the bag exceptionally versatile, offering a quarter-length zipper at the top and a zippered footbox at the bottom for easily customizable ventilation for warm-weather trips through the summer months. The hydrophobic Ultra Dry Down treatment and DWR coating on the hood and footbox ensure that the insulating down stays lofty in damp conditions, ensuring we have warm, cozy nights no matter the conditions.
Details
- Ultra-light sleeping bag for long treks through the backcountry
- 15-degree rating is designed for use in shoulder-season temperatures
- 950-fill down is extremely warm, light, and packable
- Ultra Dry Down treatment ensures down is lofty in damp conditions
- Nylon material stands up to the daily wear and tear of trail life
- DWR treatment on the hood and footbox protects against condensation
- Free Flow zip system offers three ways to regulate temperature
- Integrated draft tube and draft collar seal in warmth
- 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
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Overall Rating
4.5 based on 16 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 pageJuly 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
May 14, 2024
Best sleeping bag ever!
[This review was collected as part of a promotion.] Love this sleeping bag!!! It is probably the most comfortable, well insulated sleeping bag I've ever owned! I've attached pictures of it unrolled with no one in it, and a pic of me inside with room to spare! The hood attachment part is probably the best part in my opinion. No more cold heads when camping! Rolling it back up for storage was also super easy, which is always a plus. I would definitely recommend this to anyone camping, especially in colder climates!
Originally reviewed on influenster.com
May 4, 2024
Ultralight and toasty comfort
[This review was collected as part of a promotion.] The Sea to Summit Spark Pro Down Sleeping Bag 15F is a dream of a bag for ultralight backpacking. It packs down incredibly small, making it a great choice for long treks where every ounce counts. This high-performance bag is also comfortable and toasty, with a roomy ergonomic mummy shape that offers a good balance of warmth and wiggle room. This is an excellent choice for serious backpackers.
Originally reviewed on influenster.com
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