The Sea to Summit Spark Ultralight sleeping bag is a lightweight marvel at just 1.6 pounds, compressing to 5.4 liters. Made with resilient 10D nylon and featuring an 850 fill power down (RDS certified), it’s designed for moisture resistance and optimal warmth distribution across multiple seasons. With varying warmth versions, this bag can cater from summer nights to temperatures as low as 18°F (-8°C). Thoughtful touches like a weight-saving zipper design and a roomy mummy shape attest to the brand’s legacy of crafting functional and innovative outdoor gear.
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