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Sea To Summit Reactor Thermolite Sleeping Bag Liner

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sale $47.21 Original price:$62.95
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Stay comfortable.

Pack the Sea to Summit Reactor Thermolite Sleeping Bag Liner on trips where the weather could change drastically or for a night under the stars. This mummy shaped sleeping bad liner adds up to 15 degrees Fahrenheit to your sleeping bag and can keep you comfortable on a warm night by itself. The combination of its low weight and high compressibility makes it a painless addition to your camping quiver.

  • Liner adds fifteen degrees to mummy sleeping bags
  • Thermolite is lighter and warmer than fleece
  • Drawcord around hood cinches for secure coverage
  • Item #STS0085

Material
Thermolite
Shape
mummy
Degrees Added
15 F
Claimed Weight
9 oz
Recommended Use
camping, backpacking
Manufacturer Warranty
lifetime

Tech Specs

What do you think about this product?

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>Rating: 5

Love this!

Familiarity:
I've used it several times
Fit:
True to size

This is so small but so warm! Super cozy and helps protect my sleeping bag. I can see myself using this on it's own next summer! For now it'll make a great addition inside my sleeping bag to my fall camping trips

>Rating: 5

Warm and Soft!

Familiarity:
I've used it once or twice and have initial impressions

I recently used this liner with my Marmot Angel Fire sleeping bag on a chilly fall backpacking excursion. It got down to about 15 degrees and I don't think I would've survived the night without this liner. I like how small it packs down, how lightweight it is, and how soft it feels! No real downsides here. I think if you're trying to save a little money on a sleeping bag, you can make it warmer with this liner!

I
>Rating: 5

Sea To Summit Reactor Thermolite

Familiarity:
I've used it once or twice and have initial impressions

got this liner to accompany my sleeping bag for added warmth and comfort. I will also use this alone on mid summer nights.

>Rating: 5

Nice and comfy

Familiarity:
I've used it once or twice and have initial impressions

I wanted a sleeping bag liner that would keep me a little warmer, without restricting me inside my sleeping bag. This is great! I have the Klymit KSB bag and I love the stretch it has. This liner works amazingly with it. I'm able to stretch out how I like and still feel nice and warm. It has a hood that comes up and over your head which is a nice bonus. I am taking it on a camping trip this weekend and will see if it keeps me warmer!

>Rating: 5

perfect addition for the colder nights

Familiarity:
I've used it several times

If you don't do a lot of cold weather camping, it's great to add this is the mix instead of buying another sleeping bag.

>Rating: 5

Saved me on a cold night in Africa

Familiarity:
I've used it several times

This liner really made a difference on a cold night on a recent trek. I had a zero degree bag but still needed a little extra warmth to stay comfortable. This thing was exactly what I needed. Light, comfortable, and really does add that extra 15 degrees of warmth. It's also so small when packed that it's not really a sacrifice to add it to your pack. I feel like this actually prevents me from needing an additional sleeping bag too. Oh and when you are staying in a sketchy hostile, it comes in handy if you don't want to risk sleeping in dirty sheets!

>Rating: 4

Great Liner

This liner keeps you warm and perfect for the cold camping nights.

>Rating: 5

Great addition to your bag

Familiarity:
I've used it several times

I have used this liner a few times in my sleeping bag to help give me a few extra degrees of warmth if my normal summer bag is rated at a higher temp than what I will be camping in. I have also used this liner as a sleeping bag on its own while down in Costa Rica staying at hostels. Normally I did not need it but some times it would get colder and I would use this and it was perfect. It also helps keep the inside of your sleeping bag a lot cleaner too which is a bonus.

>Rating:

Packed size is 5x4x3

It’s pretty great! Perfect size for keeping in your bag!

It’s
>Rating: 5

Super Comfy and Warm

Familiarity:
I've put it through the wringer

I just got this and used it for a 20 day winter grand canyon river trip, where temps ranged from 20-35 degrees at night. This paired with my 15 degree bag kept me plenty warm every night, was super comfortable, and kept my sleeping bag clean. It packs down small and fits in my sleeping bag stuff sack. Over all I am extremely satisfied with this liner and would highly recommend!

>Rating: 5

Look no Further

Familiarity:
I've put it through the wringer

This liner is the perfect addition of warmth without adding too much weight or bulk to your sleeping set up. On a 45-day expedition in the Arctic, this liner crucially boosted the warmth of my going-on-10-year-old sleeping bag. My bag was still able to fit in the same size stuff sack (sea to summit's eVent), which made packing each morning easy. I also love that this liner is easy to wash, keeping my down bag in better shape for more adventures ahead. The fabric is cut for more than enough room, and stretches nicely, so you'll never feel too constricted.

>Rating: 5

Its warm

Familiarity:
I've put it through the wringer

If you need some extra warmth this is what you need or just stay home.

>Rating: 5

Extra warmth when you need it

Familiarity:
I've put it through the wringer

Nice to have around for cold weather camping and in between seasons

>Rating: 5

Saved my bacon

Familiarity:
I've used it several times

I bought this to use with the sleeping bag I rented for my Mt. Kilimanjaro climb and it saved my bacon. The sleeping bag was missing the string to "mummy" the bag around my head, so it was often challenging to keep the warm in and the cold out. I mummied up in this insert and it helped keep me warm enough, especially at Barafu camp.

>Rating: 5

Add that extra little warmth

Familiarity:
I've used it several times

I got this mostly for summer camping in the desert and to pair it with my down bag to add some warmth and protect the inside of my bag. I highly suggest this for anyone.

>Rating: 4

Quality liner

Familiarity:
I've used it once or twice and have initial impressions

This sleeping bag liner is a great one. It will add about 15 degrees of warmth to any sleeping bag for those cold nights in the woods. I'd recommend this to anyone who tends to run a little colder, to insure that you don't get cold when you're out adventuring.

>Rating: 5

Excellent liner to augment bag warmth

Familiarity:
I've used it once or twice and have initial impressions

This liner was purchased for a recent 3 day trip through Big Bend. I primarily brought it for my girlfriend who used it on the last two nights after she had a rough first night. She has stated that it was the difference between a cold, miserable, sleepless night to a wonderful night's sleep. The evening temperatures were probably around the upper 30's and she had a 20 degree bag. It is very soft, fairly light, and (according to my girlfriend) very helpful in increasing the temperature rating of your bag! I highly recommend for those who: A) Sleep a little cold B) hate grimy sleeping bags C) Hate the feeling of clammy nylon sleeping bags

>Rating: 4

Toasty warm!

Familiarity:
I've used it several times

While this liner can't protect you from roaming bears...it can help you sleep like one! I used it on a Teton backcountry trip for added warmth. For a minute I thought I was in a 5 star hotel. It's soft, adds just enough warmth, and you can pack it anywhere!

>Rating: 5

Good bag liner

Familiarity:
I've used it several times

Very happy with this bag liner. Good balance of weight, warmth and size. While the degree of warmth it adds is a bit subjective, to me it is a good 10 degrees. To address an earlier question, I am 6’4”, use a long bag and have no problem using this liner.

>Rating: 5

Warm, comfortable, highly recommend

Familiarity:
I've put it through the wringer

I used this bag hiking in the Andes, and as promised it added approx. 15 degrees of warmth (I'm very surprised to read comments to the contrary below!!). Roomy, soft, with nice ties to hold it up around your shoulders. Will use this for years to come.

>Rating:

When will more of these be in stock?

Sophia, We've got a big shipment coming to us in a few days. Let me know if you'd like me to watch this item for you and notify you when it comes in! Shoot me an email if you'd like me to do that for you.

>Rating:

What is the Length and Width of the liner?

Dimensions are 82 x 35 inches.. 6.8ft x 2.9 ft

>Rating:

What is compressed size?

>Rating:

How cold could it be outside to use it...

How cold could it be outside to use it without a bag and still be comfortable?

That really depends on how warm you like to sleep. I typically use just a liner when it is warmer than ~70 degrees at night. This is a warmer liner, so you may be able to go several degrees lower.

>Rating:

What are the dimensions? I am 6'4" and use...

What are the dimensions? I am 6'4" and use a long mummy bag. am I going to be short sheeted with this?

36" x 84".

>Rating:

is it a stretchy material?

is it a stretchy material?

yes. i have the extreme version and its like a thin loose wool sweater in consistency. not constricting like a cotton sheet or something like that.

>Rating:

Does this liner have zipper. How easy is...

Does this liner have zipper. How easy is it to get into. I wanna use it for wall climbing but if its to hard to get into its a hassle.

No zipper. There's a drawcord that goes around the opening at the top, that's the only opening. You'll have to slip down into it from the top or step into it and slip it up your body.

>Rating:

I'm about the do the Annapurna trail and...

I'm about the do the Annapurna trail and the Everest base camp trek in Nepal (huts with beds, but freezing nights). Do you think this will do (in addition to some blankets) or there is no escape from taking a sleeping bag? I'm a guy, who usually is OK with mild & cold weather. Thanks

I'd probably take a lightweight sleeping bag. You never know how many blankets you are going to find and it can get pretty chilly.