Sea to Summit Spark Down Sleeping Bag Beluga Black
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Sea to Summit Spark Down Sleeping Bag
The Sea to Summit Spark Down Sleeping Bag is built for riders and ultralight adventurers who count every gram but still demand real backcountry performance. Designed for fast-and-light backpacking and bikepacking, the Spark delivers exceptional warmth-to-weight efficiency in a minimalist, highly packable design.
At its core is 900+ fill power Ultra-Dry goose down, offering industry-leading loft, compressibility, and reliable insulation in variable conditions. Wrapped in ultra-light 10D nylon fabrics, the Spark disappears into your pack while still delivering serious warmth when temperatures drop.
The Spark isn’t just about saving weight—it’s about adaptability. The Free-Flow Zip system provides multiple ventilation options, allowing you to fine-tune airflow, vent heat, or fully open the bag into a quilt when conditions warm up.
Despite its ultralight focus, the Spark maintains comfort with an ergonomic mummy shape, technical hood, and anatomical footbox that maximize thermal efficiency without feeling overly restrictive. A combination of vertical chest baffles and box-wall construction helps keep insulation evenly distributed for consistent warmth.
Whether you’re chasing long-distance miles, dialing in a minimalist bikepacking setup, or simply looking for the lightest possible sleep system, the Spark is designed to go further—without weighing you down.
Key Features
- 900+ fill power Ultra-Dry Down for maximum warmth-to-weight performance
- Ultralight 10D shell & liner fabrics for minimal packed size and weight
- Free-Flow Zip system for ventilation and quilt-style versatility
- Ultralight mummy fit optimized for thermal efficiency
- Box baffle construction with vertical chest baffles to prevent down migration
- Technical hood and anatomical footbox for improved heat retention
- Highly compressible design for fast-and-light travel
- Zip coupling compatible with select Sea to Summit models
Specs (Regular – Approx.)
- Best Use: Ultralight Backpacking / Bikepacking
- Temperature Rating: ~30°F / -1°C (varies by model)
- Weight: ~1 lb 5.8 oz (619 g)
- Compressed Volume: ~5.3L
If your goal is to go lighter, faster, and farther, the Spark lives up to its name—delivering premium warmth and versatility in one of the most compact sleep systems available.
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