Sea to Summit Spark SpIII - Long light grey/yellow

Ultralight three-season sleeping bag built for trekkers and campers where every gram and every centimetre of pack space counts.

The Sea to Summit Spark SpIII Long is a mummy-style sleeping bag designed for three-season and cold-weather use. A 7D nylon shell pairs with 850+ loft RDS Premium ULTRA-DRY Goose Down to deliver a high warmth-to-weight ratio in a compact packed form. Expedition mummy sizing accommodates layered clothing or extra movement without compromising thermal efficiency.

Features

• Ultralight 7D nylon shell and lining for minimal packed size

• 850+ loft RDS-certified ULTRA-DRY Goose Down insulation (min. 90% down)

• Full box baffle construction reduces cold spots and accommodates extra down volume

• Vertical chest baffles keep down correctly positioned during use

• Full-length side zip with two sliders for access and ventilation control

• Zipper draft tube, insulated hood, and front neck draft collar retain heat at critical points

• Includes Ultra-Sil compression stuff sack

Technical Specifications

• Shell and lining: 100% Nylon (7D)

• Insulation: Goose Down, min. 90% down, 850+ loft, RDS certified, ULTRA-DRY treated

• Temperature rating: +2°C comfort / -8°C limit / -15°C extreme

• Body length: 198 cm

• Packed size: 15 × 31 cm

• Weight: 745 g