"What Our Gearhead® Experts Are Saying: ""The Spark 45F is my go-to when I want to keep my pack as light as possible without sacrificing real sleep. The down lofts quickly, the hood seals warmth better than most ultralight bags, and the 10D shell breathes incredibly well. It’s perfect for warm trips or pairing with a liner to extend the season."" We turn to the Sea to Summit Spark 45F when our goal is to move fast and carry almost nothing without compromising comfort. This ultralight bag is packed with 850+ fill Ultra-Dry Down that resists moisture while offering impressive loft, delivering reliable warmth for warm-weather adventures and minimalist summer objectives. The breathable 10D liner feels soft against the skin, while the 10D DWR-treated shell and water-repellent hood and footbox shed condensation and breeze throughout the night. A technical hood and draft tube help retain heat efficiently, and the half-length zipper keeps weight low without limiting ventilation when nighttime temps stay mild. For ultralight backpackers counting grams, the Spark compresses down to a shockingly small size while still providing the comfort needed for restorative sleep. Whether used alone in warm conditions or paired with a liner to stretch the season, it’s a remarkably capable bag that thrives on long miles and light packs."
Price: $349.00 from Backcountry
| Merchant | Price | |
|---|---|---|
| $349.00 | Visit Store |
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...
What Our Gearhead® Experts Are Saying: “This is the bag I point to for fast-and-light trips where nights stay mild but variable. It packs incredibly small, vents well, and still feels like a true sleeping bag—not a fragile summer quilt.”When miles...
"What Our Gearhead® Experts Are Saying: ""This is my go-to for late spring through early fall. It’s shockingly small in the pack and still cozy when temps flirt with freezing.""We keep pace with the Sea to Summit Spark 30F. Light, compressible down...