Incredibly lightweight and compressible, the Sea to Summit Spark SP I is ideal for ultra-lightweight summer backpacking or thru-hiking. It weighs well under a pound, features weather-resistant treated down insulation, and has a temperature rating of 46 Degrees F.
Renowned for their efficiency in retaining heat and compressible properties, the feathers and fibers of down have an incredibly soft, comfortable feel and, despite advances in synthetic materials, continue to provide the best warmth-to-weight ratio of any insulation available. The one inherent weakness of down insulation is that it loses much of its ability to maintain warmth when it gets wet, but the bag’s premium 850+ fill Ultra-Dry Down performs differently. Ensuring consistent thermal performance, a hydrophobic treatment enables the insulation to stay dry longer and dry faster if it should become wet than traditional down insulation. Ultra-lightweight 10D nylon exterior shell fabric has a DWR treatment to further protect the interior from moisture. A 15D nylon interior has a soft-touch fabrication that provides next-to-skin comfort.
The bag uses baffled construction to keep the insulation from migrating and creating cold spots. A fully insulated, adjustable hood bolsters warmth and a 1/3-length zipper balances weight, provides access to the interior of the bag, and maximizes thermal efficiency. A tapered footbox also helps to save weight while increasing overall warmth.
The Sea to Summit Spark SP I sleeping bag is available in your choice of Regular (fits to 6’ 0”) and Large (fits to 6’ 5”) size options. An Ultra-Sil compression stuff sack and a size-adjustable storage cube are included with each bag.
- EN Lower Limit of 46 Degrees F
- 10D UL Nylon w/ DWR shell fabric
- 15D nylon soft touch, hyigh-density weave liner fabric
- ULTRA-DRYDown 850+ Loft (90% Down Cluster Premium Goose Down)
- Responsible Down Standard certified
- 1/3-length #3 YKK zipper
- Sewn-through transverse baffle construction
- 55/45 down fill ratio top/bottom
- Anatomically-tapered footbox
- Compressed volume of 1.55 liters (Regular)
- Lightweight Ultra-Sil compression bag and storage cell/laundry bag
Best Use Backpacking Insulation Type Down Item Weight Regular: 12.3 oz
Long: 13.8 oz
Other Stuff Sack and Storage Cube Included Warranty Limited Lifetime Packed Size 4" x 4" (Compressed) Shell Material 10D UL Nylon w/ DWR Liner Material 15D Nylon soft-touch, high-density weave Fits to Length Regular: 6' 0"
Long: 6' 5"
Fill Material Ultra-DRYDown 850+ premium goose down Temperature Rating 46 Degrees F
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