Sea to Summit Spark -9C Regular Sleeping Bag

The Sea to Summit Spark -9C Regular is a premium down sleeping bag designed for ultralight backpacking and cold-weather adventures. With an EN Limit temperature of -9°C (15°F), it provides reliable warmth for three-season use and beyond. The bag features RDS 850+ Loft ULTRA-DRY Down™, a hydrophobic down treatment that resists moisture and retains loft even in damp conditions. The 10D nylon shell and liner are lightweight yet durable, and the box baffle construction prevents down shifting for consistent insulation.

Advantages

Ultralight and packable, the Spark -9C Regular compresses to just 6.5 liters, making it ideal for minimalist backpackers. The ULTRA-DRY Down™ treatment ensures the bag performs in humid environments, while the mummy shape and drawcord hood minimize heat loss. The half-length YKK #3 zipper reduces weight and allows easy ventilation.

Suitable for

• Ultralight backpacking and thru-hiking
• Three-season camping in cold climates
• Mountaineering and alpine adventures
• Sleepers up to 183 cm (6 ft) tall

Key specifications

• EN Comfort Temperature: -2°C (28°F)
• EN Limit Temperature: -9°C (15°F)
• EN Extreme Temperature: -27°C (-17°F)
• Fill: RDS 850+ Loft ULTRA-DRY Down™, 380 g (13.4 oz)
• Shell & Liner: 10D Nylon
• Shape: Mummy
• Zipper: 1/2-length YKK #3
• Shoulder Girth: 155 cm (61 in)
• Hip Girth: 135 cm (53 in)
• Foot Girth: 88 cm (35 in)
• Packed Dimensions: Ø15 x 30 cm (6 x 12 in)
• Packed Volume: 6.5 L
• Construction: Box Baffle
• Included: Ultra-Sil™ compression sack, storage cell

Recommendations

For best performance, store the sleeping bag loosely in the provided storage cell to maintain loft. Use a sleeping pad with an R-value appropriate for the conditions. The Spark -9C is an excellent choice for gram-conscious adventurers who demand warmth without excess weight.