Sea to Summit Spark 15
Best Value
What Buyers Say
Loved
✓Industry-leading warmth-to-weight ratio
✓Ultra-Premium 850+ fill power down
✓Innovative ULTRA-DRY Down treatment
Mentioned
–Very high price point
–Minimal features for comfort
About
Temperature-rated sleeping bag with quality insulation and efficient packed size. Engineered for warmth, comfort, and durability across seasons. The Spark 15 sets the ultralight sleeping bag standard with exceptional warmth-to-weight ratio using premium 850+ fill down and innovative construction. Its sub-pound weight without compromising comfort makes it a category-defining choice for ultralight backpacking and mountaineering.
GearScore™ Verdict
90.0/100
PlatinumScore Breakdown
⚡Performance(35%)ⓘ86
◆Durability(25%)ⓘ48
◆Value(20%)ⓘ40
★User Reviews(15%)ⓘ113
◆Brand Trust(5%)ⓘ180
Specifications
Packed Size6 x 10 inches
Country of ManufactureUSA
Fill Power850
Fill Type850+ fill power goose down (RDS-certified, Ultra-Dry Down treatment)
Fill Weight1 lb 0.9 oz / ~16 oz (approximately 480 grams for regular size)
Packed Size6.8 liters (regular); 7.6 liters (long)
ShapeMummy (ergonomic mummy shape)
Shell Material10-denier nylon shell with non-PFAS DWR; 10-denier nylon liner
Temperature Rating15°F / -9°C (Lower Limit); 29°F / -2°C (Comfort Rating)
Total Weight1 lb 9.7 oz / 730 grams (regular); 1 lb 11.7 oz / 730 grams (long)
Weight14.8 oz