A highly versatile, tapered rectangular down sleeping bag engineered with a unique triple-zip Free-Flow ventilation system for multi-season adaptability and maximum comfort.
The Sea to Summit Ascent AcI is designed for the adventurer who needs one bag to handle varying conditions. It features a tapered rectangular shape that offers significantly more wiggle room than a traditional mummy bag while maintaining thermal efficiency. Insulated with 750+ Loft ULTRA-DRY Down, it provides exceptional warmth-to-weight performance and is treated to resist moisture, ensuring the down stays lofty even in damp environments. The standout feature is the Free-Flow Zip System: a full-length left-side zip, a half-length right-side zip, and a separate foot zip. This allow you to fold down the top like a quilt, provide targeted ventilation, or open the bag completely flat for use as a comforter in warmer weather.
Key Technical Features
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750+ Loft ULTRA-DRY Down: Premium RDS-certified duck down treated with a PFC-free water-repellent finish to maintain loft and warmth in wet conditions.
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Free-Flow Triple-Zip System: Provides unparalleled ventilation options, allowing the bag to be transformed from a sealed winter cocoon to a flat quilt.
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Vertical Chest Baffles: Specifically engineered to prevent down from shifting to the sides of the bag, ensuring consistent warmth over the torso.
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Tapered Rectangular Cut: Balances the weight-saving benefits of a mummy bag with the internal space of a rectangular bag for side-sleepers or those who move at night.
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Zip Coupling: This bag is designed to pair with compatible Sea to Summit women’s Altitude bags to create a secure double sleeping system.
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Oversized Draft Tubes: Large, down-filled tubes along the zips and neck collar prevent "cold spots" and trap body heat inside.
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3D Hood & Footbox: Anatomically shaped compartments that allow the down to loft fully around your head and feet without being compressed.
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Internal Pocket: A secure zip pocket located inside the bag for keeping electronics or valuables warm and accessible.
Technical Specifications
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Temperature Rating (Comfort): 3°C
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Temperature Rating (Lower Limit): -1°C
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Insulation: 750+ Loft ULTRA-DRY Down (90/10 Duck Down).
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Shell Fabric: Lightweight 20D Nylon.
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Weight: Approximately 880g (Regular size).
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Compressed Volume: 5.5 Litres (Regular size).
Best For
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Three-Season Hiking: Perfectly suited for Australian autumn and spring conditions where overnight temperatures hover near freezing.
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Bike Packing & Kayak Touring: Its compact compressed size and moisture-resistant down make it ideal for space-sensitive adventures.
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Restless Sleepers: The extra internal width is a significant advantage for those who find traditional mummy bags too restrictive.
