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

Reactor liner Spark down mummy sleeping bag two

$408
Updated 2026-10-15

Featuring a high-performance Reactor thermal liner, this ultralight down mummy sleeping bag expands temperature versatility for overnight trips. The integrated liner technology helps boost core warmth when outdoor conditions turn unexpectedly cold.

Premium down fill provides outstanding insulation while keeping the complete sleep system remarkably light and compressible. The contoured mummy geometry ensures optimal thermal efficiency, wrapping the body securely for a restful night.

Crafted for weight-conscious backpackers, this package balances portability with reliable cold-weather protection. It offers a sophisticated sleeping solution designed to perform smoothly in demanding wilderness environments.

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Sea to Summit
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Sleeping bags Ultralight gear Down Bag liners
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Down Ultralight gear Bag liners Sleeping bags