Sea to Summit Reactor Extreme Mummy Sleeping Bag Liner Compact
Best price now
$51.97at BackcountryChecked Nov 12
Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
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The Reactor Extreme is a mummy-shaped sleeping bag liner made from a stretchy polyester knit with Thermolite fibers. Sea to Summit rates it to add up to about 25°F of warmth to a sleeping bag, which is more than most silk or cotton liners claim. It suits cold sleepers, backpackers extending a three-season bag, and travelers who want a clean layer inside hut or hostel bedding. It packs small and weighs little, but it is a liner, not a bag, and the warmth gain depends on how well it fits your bag.
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Lowest price we've seen: $51.97 on Nov 13 at Backcountry. Tracked across 1 store since Nov 13.
Owners generally rate the Reactor Extreme as one of the warmer liners available and say it makes a noticeable difference in a three-season bag. Some find the stretchy synthetic fabric clammy or too snug, and a few say the added warmth falls short of the claimed figure.
