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

Sea to Summit

Reactor liner Spark down mummy sleeping bag three

$401

Updated 2026-10-15

This ultralight down mummy sleeping bag integrates a specialized Reactor liner to enhance thermal output on chilly outdoor adventures. The added layer improves overall heat retention while maintaining a remarkably streamlined profile.

Quality down insulation fills the internal baffles to create a cozy microclimate that guards against dropping ambient temperatures. The fitted mummy shape minimizes heat loss and promotes efficient warming throughout extended rests.

Tailored for backpackers who value efficiency, this versatile sleep combination provides reliable shelter in variable climates. It delivers essential warmth and packability for long-distance trail explorations.

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