Sea to Summit Trek -9C Down Sleeping Bag Long snorkel blue

A mummy bag built for three-season and cold-weather use, with travel-ready packability and moisture-resistant down insulation.

The Sea to Summit Trek -9°C Down Sleeping Bag (Long) uses RDS-certified 650+ loft Ultra-Dry Duck Down in a tapered mummy cut. A 60/40 top-to-bottom fill ratio concentrates insulation where heat loss is greatest, while vertical chest baffles prevent down migration. The bag packs into an included Ultra-Sil compression bag, making it practical for travel and extended trekking.

Features

• RDS-certified Ultra-Dry Duck Down (650+ loft) — moisture-resistant, maintains loft in damp conditions

• Vertical chest baffles and side block baffle construction prevent down migration and maintain the 60/40 fill ratio

• Two-way #5 YKK side zip plus separate foot zip — converts to a quilt and allows ventilation adjustment

• Oversized zip draft tube with anti-snag material

• Zip coupling system — pairs with a compatible bag

• Includes Ultra-Sil compression bag and storage cell

Technical Specifications

• Shell: Recycled 20-denier Polyester

• Lining: Recycled 20-denier Polyester

• Insulation: Ultra-Dry Duck Down, 650+ loft (RDS certified)

• Temperature comfort rating: -9°C

• Shape: Mummy

• Body length: 198 cm (Long)

• Shoulder circumference: 168 cm

• Hip circumference: 159 cm

• Foot circumference: 143 cm

• Weight: 735 g