Sea To Summit Spark SpI 40ºF Ultra-Dry Down Ultralight Sleeping Bag

The Spark™ Ultralight uses premium materials and a no-frills design to provide cutting-edge performance for its designed end-use.

Spark Ultralight does not mean ultra-tight. The bag is snug, but still has adequate girth for performance-oriented backcountry users. 

• Ultra-Dry Down® 850+ loft 90% down cluster premium duck down
• Down certified to the Responsible Down Standard (RDS)
• Sewn-through construction
• 1/3 length left side YKK® #3 zipper
• Lightweight Ultra-Sil™ compression bag and storage cell included
• Manufacturer’s lifetime guarantee
• Shell material: 10D nylon
• Fits up to: 6′ 0″ (regular), 6′ 4″ (long)
• Temperature (EN rating): Comfort range 40ºF to 60ºF 
• Women’s temperature (EN rating): 44º comfort
• Compressed volume: 1.5 liters (regular)
• Compression sack: 2.5 to 1 liter 
• Fill weight: 6.3 oz. (regular); 7.2 oz. (long)
• Suggested use: Ultralight backpacking, bike touring