Sea to Summit Spark Pro -1°C Regular Sleeping Bag

The Sea to Summit Spark Pro -1°C Regular is a premium down sleeping bag designed for ultralight backpacking and mountaineering. With a comfort temperature rating of 4°C and a limit of -1°C, it provides reliable warmth for three-season adventures. The bag features 850+ loft RDS Certified ULTRA-DRY Down™, ensuring exceptional insulation even in damp conditions. Its mummy shape and vertical chest baffles optimize thermal efficiency while minimizing weight.

Advantages

Ultralight construction at just 280g of fill weight, combined with a 10D nylon shell and 7D nylon liner, makes this bag incredibly packable. The ULTRA-DRY Down™ treatment provides water resistance, maintaining loft in humid environments. The #3 YKK zipper with draft tube prevents heat loss, and the included compression sack reduces packed volume to 3.5L.

Suitable for

• Ultralight backpacking and thru-hiking
• Three-season camping in temperatures down to -1°C
• Mountaineering and alpine adventures
• Sleepers up to 183 cm tall (Regular size)

Key specifications

• Temperature Rating (Comfort): 4°C (39°F)
• Temperature Rating (Limit): -1°C (30°F)
• Temperature Rating (Extreme): -16°C (3°F)
• Fill Power: 850+ Loft
• Fill Material: RDS Certified ULTRA-DRY Down™
• Fill Weight: 280 g
• Shell Fabric: 10D Nylon
• Liner Fabric: 7D Nylon
• Shape: Mummy
• Max User Height: 183 cm
• Packed Dimensions: 13 x 26 cm
• Compressed Volume: 3.5 L
• Zipper Side: Left
• Zipper Type: #3 YKK
• Construction: Vertical chest baffles, horizontal lower body baffles
• Water Resistance: ULTRA-DRY Down™ treatment
• Draft Tube: Yes
• Storage Sack Included: Yes
• Compression Sack Included: Yes

Recommendations

For optimal performance, pair with a Sea to Summit sleeping pad and a bivvy or tent. Store loosely in the storage sack to maintain loft. Avoid prolonged compression.