STS - SEA TO SUMMIT Alpine Down Sleeping Bag - RCS RDS

Engineered for high-altitude expeditions and extreme cold climates, the Sea to Summit Alpine Down Sleeping Bag is your ultimate companion for winter adventures. This expedition-grade mummy-style sleeping bag features a roomy fit to accommodate extra layers and winter gear, without sacrificing thermal efficiency or mobility.

Technical Highlights

• Maximum Warmth: 850+ fillpower, RDS-certified goose down insulation ensures exceptional loft and warmth-to-weight ratio—trapping heat efficiently in temperatures as low as -20°F (-29°C).
• Responsibly Sourced: Down is certified to the Responsible Down Standard (RDS) and features a non-PFAS Ultra-Dry Down finish for water resistance and durability, even in damp conditions.
• Eco-Friendly Materials: Recycled 20D nylon shell and lining (RCS-certified) combine lightweight durability with sustainability.
• Expedition Fit: Roomy mummy shape allows for essential layering and comfort, while the technical hood, double draft tubes, and draft collar seal in warmth and block out cold air.
• Advanced Features: Modified Free-Flow Zip system for ventilation and versatility, QuiltLock™ system for integrating a quilt for added warmth, and ergonomic body-mapped insulation placement.
• Compact & Lightweight: Weighs just 2 lb 8 oz (1645g), compresses to 14L, making it easily packable for mountaineering or long-distance winter treks.

Who It’s For

Perfect for mountaineers, alpinists, and cold-weather backpackers who demand uncompromising performance, versatility, and comfort in the harshest environments.