Online: www.REI.com
URL for this product:

From the U.S. and Canada — Call 1-800-426-4840
Mon. through Sun., 4 a.m. through 11 p.m. PT.
International — Call 1-253-891-2500
Mon. through Sun., 4 a.m. through 11 p.m. PT. English language only.

Sea to Summit Reactor Thermolite Mummy Bag Liner

BLACK

Sea to Summit Reactor Thermolite Mummy Bag Liner

$54.95

(59)

Item # 705534

100% Satisfaction Guaranteed
Gear and Advice You Can Trust

This item ships for free! Learn more

To view videos or use the zoom feature on REI's websites, please download the latest version of Adobe Flash Player.

NOW PLAYING

Introducing the Reactor® Thermolite Mummy Liner—the first to use Thermolite® from Dupont.

Thermolite is a hollow-core fiber that provides extraordinary warmth for its weight and remains extremely breathable
It's very comfortable, more compact and warmer for its weight than fleece liners
Adds up to 15°F degrees of warmth to a sleeping bag, or can be used on its own as the ideal warm-weather bag
Thin drawcord with tiny cord-lock around the hood
Very light and compact!

Imported.

Item 705534

$10.99

with coupon code ANNV13
May 17-27 Details

Not a member? Add a Membership

View all Sea to Summit products

REI Membership

REI Membership $20.00

Sea to Summit Reactor Thermolite Mummy Bag Liner Customer Reviews

REVIEW SNAPSHOT®

by PowerReviews

Sea to Summit Reactor Thermolite Mummy Bag Liner

4.3

(based on 59 reviews)

90%

of respondents would recommend this to a friend.

Pros

Lightweight (53)
Easy to pack (52)
Compact (49)
Comfortable (45)
Durable (25)

Cons

Narrow / tight (5)

Best Uses

Backcountry camping (51)
Camping (32)
Winter conditions (31)
Road trips (18)
Day trip (14)

- Reviewer Profile:
- Avid adventurer (35), Casual/ recreational (13), Outdoor professional (5), Casual adventurer (3)
- What Is Your Gear Style:
- Survivalist / minimalist (32), Comfort driven (15)
- Was this a gift?:
- No (25)

Reviewed by 59 customers

Sort by

Displaying reviews 1-10

Previous | Next »

Apr

2013

1.0

Not good as summer bag

By HikerDog

from Northern Virginia

About Me Military/Law Enforcement

See all my reviews

Pros

Easy to pack
Lightweight

Cons

Too thin

Best Uses

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

I bought this to use as summer bag (when temps at nite are above 60), and to augment my 32 deg bag in early spring & late fall. Is very thin and provides zero padding. Is lite, but I have lite blanket I have used in the past that provides more warmth, comfort, versatility and can be wrapped over my shoulders while hiking or by the campfire. This product is just a thin liner and really didn't provide much additional warmth at nite by itself. In the 32 deg bag provided some extra warmth, but get same from extra pair of wool socks and sweater.

Comment on this review

Apr

2013

5.0

Works as advertised.

By MrEngineer

from Loveland, CO

About Me Avid Adventurer

See all my reviews

Pros

Comfortable
Compact
Durable
Easy to pack
Good venting
Lightweight

Cons

Best Uses

Backcountry Camping
Day Trips
Winter Conditions

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

Bought two of these to give us a little extra warmth on the cold nights as well as to keep our bags clean. These worked very well for this. They breathe, are comfortable, large enough for a 6'2" 200lb man, and are all around durable.

Comment on this review

Apr

2013

(0 of 2 customers found this review helpful)

1.0

not adding any heat

By VITALE77

from CAPE COD

About Me Casual/ Recreational

See all my reviews

Pros

Lightweight

Cons

Too thin

Best Uses

Backcountry Camping

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

will keep your bag clean but adds no warmth

Comment on this review

Apr

2013

4.0

Light and Toasty

By Big or Home

from Colorado

About Me Avid Adventurer

See all my reviews

Pros

Comfortable
Easy to pack
Lightweight

Cons

Best Uses

Backcountry Camping
Day Trips
Hammocking

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

This liner is pretty handy. I got it mainly because I didn't want to drop $300+ on a sleeping bag for winters in the rocky mountains. It adds significant warmth to my bag with very little weight. I also use it as a stand alone when I am in warmer climates (like Hawai'i) for backpacking. With a tarp, a hammock and this liner, you can travel pretty light. Its also nice for hanging out in the hammock when its not all that warm out. The black color helps even more to keep you toasty.

Comment on this review

Mar

2013

5.0

Sea to Summit Thermolite Bag Liner

By Sean Hikes

from Mansfield, MA

About Me Avid Adventurer

See all my reviews

Pros

Comfortable
Compact
Durable
Lightweight

Cons

Best Uses

Backcountry Camping
Campgrounds
Winter Conditions

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

I've used this liner twice so far. Once with a 25 degree bag in New Hampshire with temps in the teens and again in Vermont with my 0 degree bag when temps were single digits. It didn't turn my bags into sauna's but I definitely noticed a difference to the overall temp comfort of them.
What I actually liked the most about it was how it seperated me from the icky clammy feeling that bags get due to moisture; like in winter when my head is tucked inside the bag and I'm breathing inside it!
I was very surpised at how strong the liner material is. It looks very flimzy and tearable but is actually quite strong. I'm looking forward to trying it this summer with a thin sheet instead of carrying a sleeping bag.

Comment on this review

Feb

2013

5.0

Lifesaver

By jchamp23

from Boston, MA

About Me Avid Adventurer

See all my reviews

Pros

Comfortable

Cons

Best Uses

Backcountry Camping
Campgrounds
Winter Conditions

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

I bought this liner for a trip to a White Mountain hut. It was expected to be -10 degrees or lower and I only have a bag rated to 18 degrees. The liner worked like a charm. It was exactly 0 in the hut, but the liner kept me warm all night. Brilliant.

Comment on this review

Jan

2013

(3 of 3 customers found this review helpful)

4.0

roasty toasty

By ecogyrl

from berea, ky

About Me Avid Adventurer

See all my reviews

Pros

Comfortable
Compact
Easy to pack
Lightweight

Cons

Best Uses

Backcountry Camping
Campgrounds
Day Trips
River Trips
Road Trips
Survival
Winter Conditions

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

i've only had one opportunity to use this since i just purchased it, but so far, so good. we camped in 20 degree weather and my husband had to shed his after getting too warm (we also have 0 degree bags, but they are ~15 years old) so i doubled up and had the best camp sleep ever. he would likely leave a less glowing review since he is a human radiator and also like to turn cartwheels in his sleep and found the liner a bit too confining. typically, we zip our bags together which gives him a bit more room to kick me in his sleep, however, since these are super light, there are no zippers to combine them so he was additionally confined to his own sleeping bag (probably another reason i slept so good!). short story long - i loved the liner, but he would probably have a different story.

Comment on this review

Jan

2013

1.0

Not worth the money

By ChazC

from Alabama

About Me Avid Adventurer

See all my reviews

Pros

Compact
Easy to pack
Lightweight

Cons

Too thin

Best Uses

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

Certainly not what I expected. The liner could benefit from a zipper, getting in it isn't easy...especially if you're a bigger or taller person. Personally feel it's about $30 overpriced for what you get, not worth the money and found it to be more of a hindrance. Will be returning the two I bought from REI.

Comment on this review

Jan

2013

(1 of 1 customers found this review helpful)

4.0

Great for when you're just not sure.

By pinemt.guy

from Pine Mountain, Georgia

About Me Casual/ Recreational

See all my reviews

Pros

Comfortable
Compact
Easy to pack
Lightweight

Cons

Best Uses

Backcountry Camping
Road Trips
Winter Conditions

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

I went hiking/camping last weekend and almost did not bring this along due to a warmer than average weather forecast. Ultimately, I decided it was so light it was worth the extra few ounces. Around 3 a.m. the wind on the mountain really picked up and it was cutting right through my sleeping bag. I pulled this liner out and and almost immediately felt the difference. This made the difference between a miserable night and being too cozy in the morning to want to get up.

Comment on this review

Oct

2012

(1 of 1 customers found this review helpful)

4.0

Compact and versatile

By Work Earn Buy

from Cary, NC

About Me Casual/ Recreational

See all my reviews

Pros

Comfortable
Compact
Easy to pack
Lightweight

Cons

Best Uses

Backcountry Camping
Survival

Comments about Sea to Summit Reactor Thermolite Mummy Bag Liner:

I bought this bag for several reasons, but primarly for a lightweight and warm weather bag. I'm in NC and do most camping in NC and it's warm here most of the year. I bought this bag/liner and have so far only used it alone. And that's what I wanted it for. It's cozy to sleep in and just right for warm weather camping. In "cool" weather, I've used it with a space blanket over it and was fine too. I haven't yet tried as a bag liner, but based on its solo performace I'm sure it will add a few deg of warmth to my mummy bag. I also keep it in a survival pack in my trunk when not camping.