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

Reactor liner Spark down mummy sleeping bag five

Updated 2026-10-15

This ultralight down mummy sleeping bag incorporates a Reactor liner to provide extra thermal protection during alpine camping. The combination enhances overall sleep system warmth without adding excessive bulk to a backpacker's load.

Lightweight down insulation traps heat effectively, creating a comfortable sanctuary after a long day of hiking. The tailored mummy cut reduces internal air volume, allowing the body to heat the space rapidly.

Engineered for outdoor enthusiasts undertaking multi-day treks, this setup combines portability with dependable thermal capabilities. It serves as an essential tool for achieving quality rest in remote environments.

Check details
Reactor liner Spark down mummy sleeping bag five
Same brand

Rest of the Sea to Summit set

Close matches

Also in this catalog

At a glance

The details

Line
Sea to Summit
Marked
Sleeping bags Ultralight gear Down Bag liners Fleece liner
Sets
Down Fleece liner Ultralight gear Bag liners Sleeping bags