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Fast-and-light comfort comes easy in the Spark Pro Down Sleeping Bag
What Our Gearhead Experts Are Saying:“I recommend this to ultralight backpackers who still want real comfort. It’s warm for the weight, the liner feels great, and the zipper vents let you tune temperature instead of sweating through the night.”
Cold nights feel a lot less intimidating when your sleep system packs small and still delivers real warmth. The Spark Pro Down Sleeping Bag is built for fast-moving trips where you’re counting ounces all day but still want to wake up rested for another big push. Sea to Summit gives you a true three-season bag that doesn’t force you into a tight, restrictive fit when the temps dip.
Inside, 950+ fill-power RDS-certified goose down with a non-PFAS Ultra-Dry Down treatment lofts quickly to trap heat efficiently, while highly breathable 10-denier fabrics keep the bag comfortable when conditions fluctuate. A technical hood, front draft collar, and anatomical footbox seal in warmth where it matters most. The Free-Flow Zip system adds real versatility?open the side, shoulder, or footbox zips to dump heat, or unzip the bag flat into a quilt when the night stays mild. For ultralight backpacking in the shoulder seasons, it’s a high-end blend of warmth, ventilation, and packability.
Details
- Ultralight 15°F down mummy bag built for three-season backpacking
- 950+ fill-power RDS down with non-PFAS Ultra-Dry Down treatment
- Free-Flow Zip system vents at side, shoulder, and footbox
- Technical hood, draft collar, and anatomical footbox retain warmth
- Highly breathable 10D shell and liner improve comfort across temps
- Item #STSZ0DH
Tech Specs

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