Sleeping bags / Sea to Summit / Reactor liner Spark down mummy sleeping bag four
Sea to Summit

Reactor liner Spark down mummy sleeping bag four

Updated 2026-10-15

Designed with an included Reactor thermal liner, this ultralight down mummy sleeping bag maximizes cold-weather adaptability. The supplementary liner boosts core warmth, making it easier to manage fluctuating nighttime temperatures in the wilderness.

Advanced down fill ensures high loft and superior insulation capacity while preserving a lightweight footprint. The ergonomic mummy design hugs the contours of the body to prevent cold spots and retain warmth efficiently.

This comprehensive sleep configuration supports backpackers seeking reliable performance and minimal pack weight on the trail. It offers a balanced approach to outdoor sleeping comfort through smart material integration.

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Reactor liner Spark down mummy sleeping bag four
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Sea to Summit
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Sleeping bags Ultralight gear Down Bag liners Fleece liner
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Down Fleece liner Ultralight gear Bag liners Sleeping bags