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Spark Sleeping Bag: 45F Down - Women's
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Ultralight Spark 45F Women’s delivers warm-weather efficiency with a dialed fit
What Our Gearhead® Experts Are Saying:
"This women’s Spark is one of the best warm-climate ultralight bags out there. The fit really matters—it’s cozy without dead space that would rob warmth. The 850+ down lofts fast, the hood seals nicely, and it still packs insanely small. Perfect for lightweight summer missions."
We grab the Sea to Summit Spark 45F Women’s Sleeping Bag when warm-weather adventures demand minimal weight without sacrificing a good night’s rest. Women’s-specific shaping enhances thermal efficiency by reducing dead air while giving extra room where it's needed for natural, comfortable sleep positions. With lofty 850+ Ultra-Dry Down inside a breathable 10D liner, the Spark maintains a soft, airy feel ideal for summer and shoulder-season objectives.
A 10D shell treated with non-PFAS DWR resists condensation and wind, while the highly water-repellent hood and footbox add extra protection in damp alpine environments. The half-length zipper keeps bulk low but still allows for easy venting when nights run warm. Packing down to an impressively small volume, this bag is made for fast, light movement without compromising comfort.
Details
- Designed for warm-weather ultralight backpacking with women’s-specific fit
- 850+ Ultra-Dry Down offers high loft and dependable insulation in humid conditions
- 10D liner provides breathable comfort ideal for warm climates
- Non-PFAS DWR-treated shell sheds condensation and light moisture
- Technical hood and draft tube retain warmth efficiently
- Half-length zipper saves weight while allowing ventilation
- Packs as small as 2.9L for minimal pack footprint
- Item #STSZ0AF
- Material
- nylon with non-PFAS DWR
- Shape
- mummy
- Insulation
- RDS-certified 850+ fill power Ultra-Dry Down (non-PFAS)
- Stuff Size
- [regular] 2.9L, [long] 3L
- Claimed Weight
- [regular] 13.5oz (382g), [long] 15.2oz (431g)
- Activity
- camping, travel
- Manufacturer Warranty
- limited lifetime
- Bag Length
- [regular] 5ft 7in, [long] 6ft 1in
- Degree
- 45°F
- European Norm/ISO Comfort Rating
- 45°F (7°C)
- European Norm/ISO Lower Limit Rating
- 39°F (4°C)
Your Ally In Every Adventure
Since 1991, Sea to Summit has been there for every adventure. Designed to be the perfect balance of clever, packable, and light, Sea to Summit products encourage self-reliance anywhere.