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Sea to Summit Reactor Insulated Sleeping Bag Liner

4.6 4.6 out of 5 stars 2,115 ratings
$84.95
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Extreme Compact (78 X 31.5)
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About this item

  • thermolite
  • Imported
  • Insulated sleeping bag liner adds extra warmth and personal hygiene to any sleeping bag.
  • Thermolite Pro technology using knitted, hollow-core fibers and absorbing infrared ceramic pigments to reflect your body's heat back to the wearer for enhanced warmth and comfort
  • Drawcord footbox can be opened or closed for optimal comfort and integrates perfectly with the footbox of our Free-Flow Zip system in select Sea to Summit sleeping bags
  • HeiQ Fresh odor control technology helps keep the liner fresh even after extended use
  • Knitted fabric provides incredible stretch and freedom of movement in this mummy-shaped liner and works seamlessly with sleeping bags of any shape, Sea to Summit Guarantee is offered for the Lifetime of this product

Top Brand: Sea to Summit

Highly Rated
50K+ customers rate items from this brand highly
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Product Description

Sea to Summit Reactor series insulated sleeping bag liners can extend the comfort range and improve personal hygiene of any sleeping bag. Thermolite hollow core fibers are constructed like the fur of a polar bear, efficiently trapping heat and providing a luxuriously soft, comfortable feel. The stretch-knit fabric provides optimal comfort, and ensures the Reactor fits any sleeping bag. Additionally, the drawcord footbox offers plenty of ventilation and the versatility of walking around camp while still wearing your liner. Available in three different weights, Reactor technical liners make your existing sleeping bag warmer and more versatile. The Regular Liner uses hollow-core Thermolite Pro fabric with infra red-absorbing ceramic pigments and Thermolite EcoMade fibers. This lightweight fabric adds up to 14F of warmth to your sleep system. The Extreme Liner features a thicker hollow-core Thermolite Pro fabric to add up to 25F of warmth to your sleep system. The Fleece Liner employs hollow-core Thermolite Pro fibers in a grid-pattern to deliver our warmest sleeping bag liner which adds up to 32F of warmth to your sleep system.

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Sea to Summit Reactor Insulated Sleeping Bag Liner

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Customer reviews

4.6 out of 5 stars
4.6 out of 5
2,115 global ratings

Customers say

Customers like the warmth, texture, weight and size of the sleeping bag liner. For example, they mention that it brings an extra warmth to the sleeping bags, eliminates the natural cold spots and that it's very soft to the touch. Some are impressed with performance given the weight and compact storage. That said, opinions are mixed on value.

AI-generated from the text of customer reviews

156 customers mention131 positive25 negative

Customers like the warmth of the sleeping bag liner. They say it brings an extra warmth to the sleeping bags, extends the thermal range, and keeps them toasty without sweating. Some say that it eliminates the natural cold spots. Overall, customers are satisfied with the warmth and cozy feel of the liner, which makes their sleeping bags.

"...The second night so cold our water froze. This liner not only made my sleeping bag cozy but added every bit of extra warmth advertised and some...." Read more

"...So I had to use for couple nights and it was comfy and warm. Really impressed with performance given the weight and compact storage...." Read more

"...If you want to camp in the cold, you NEED this liner. It’s warm, cozy, easy to use, easy to clean…...." Read more

"Got of a recent winter camping trip and feel like it did add some warmth to my 20 F degree bag. It’s very soft and light weight...." Read more

69 customers mention67 positive2 negative

Customers like the texture of the sleeping bag. They mention it's very soft to the touch, and feels much smoother on their skin than a cocoon. It works well to keep them comfortable on a backpacking or bikepacking trip, and is comfortable down to just below freezing. The bag liner is soft and nice to touch, comparable to the fleece one. Customers say it'll be a great addition to their sleep system, especially when night time temperatures are low.

"...piece of my sleeping gear even in warmer weather - it adds that extra bit of comfort and to any sleeping bag...." Read more

"...So I had to use for couple nights and it was comfy and warm. Really impressed with performance given the weight and compact storage...." Read more

"...It’s very soft and light weight...." Read more

"...’s very small when packed compared to a sleeping bag and works well to keep you comfortable on a backpacking or bikepacking trip on warm nights...." Read more

66 customers mention54 positive12 negative

Customers like the size of the sleeping bag. They say it packs up small and light, and takes up a small amount of space. Some customers also say it's easy to carry as a supplement to the sleeping bags. Overall, most are satisfied with the size and weight of the product.

"...Really impressed with performance given the weight and compact storage. Can’t wait to use this on the trail. Passes the test in my book." Read more

"...Turns out my favorites use for it is as a summer bag. It’s very small when packed compared to a sleeping bag and works well to keep you comfortable..." Read more

"...When I need the extra warmth, there it is! It takes up a small amount of space. Perfect for my purposes." Read more

"...Some quick PROS that I'll add are the packability, weight, and warmth.After sewing the seam on my own I will continue using this liner...." Read more

66 customers mention61 positive5 negative

Customers are satisfied with the weight of the sleeping bag. They mention that it's soft, warm, and easy to carry. Some are also impressed with the performance given the weight and compact storage.

"...Really impressed with performance given the weight and compact storage. Can’t wait to use this on the trail. Passes the test in my book." Read more

"...It’s very soft and light weight...." Read more

"...It is comfortable, light and easy to wash." Read more

"...Some quick PROS that I'll add are the packability, weight, and warmth.After sewing the seam on my own I will continue using this liner...." Read more

41 customers mention35 positive6 negative

Customers like the performance of the sleeping bag. They mention it works well for its purpose, and is effective as a liner. Some say it's heavy but helps a lot. Overall, most are satisfied with the performance and durability of the product.

"...with the feel of the material, the durability, and effectiveness of the bag liner...." Read more

"...It takes up a small amount of space. Perfect for my purposes." Read more

"This SeatoSummit product performs very well, and may be the best money I've spent as I figure out products that work well for me...." Read more

"Worked perfect for my very cold night camping, would’ve been a struggle without this" Read more

32 customers mention25 positive7 negative

Customers like the quality of the sleeping bag. They mention it's well made, has great material, and is durable. Some say it'll be a great stand alone bag during the summer months. They also say it adds a lightweight layer for backpacking and is a fantastic addition to their pack.

"Really satisfied with the feel of the material, the durability, and effectiveness of the bag liner...." Read more

"...2. ❤️❤️❤️❤️🤍 Quality; The craftsmanship of this product is truly impressive. The fabric feels incredibly soft with a silky and cool texture...." Read more

"...I don't mean to be overly critical. The product is well made, it definitely packs the tightest of any option, and it does add some warmth - not 14F,..." Read more

"...BUT, aside from the hassle of getting into it and having a torn seam out of the package (still salty about it), I will say that this liner DID add..." Read more

26 customers mention26 positive0 negative

Customers find the lining of the sleeping bag easy to clean. They mention that it keeps the inside of the bag clean and prevents human filth from soiling the interior. They also appreciate the small size and light weight of the product.

"...I also love the lining between dirty, several days into the trip body and the sleeping bag...." Read more

"...It’s warm, cozy, easy to use, easy to clean…. My dog got into my sleeping bag with me and it’s safe to say that she approves too!" Read more

"...It’s also much easier to wash than a sleeping bag. So it’s nice to use on trip you might be rolling a little grubby...." Read more

"...It is comfortable, light and easy to wash." Read more

54 customers mention27 positive27 negative

Customers have mixed opinions about the value of the sleeping bag. Some find it worth the purchase, excellent, and well-made, while others say it's too pricey and a waste of money.

"...Well worth the extra money and space in the pack...." Read more

"It's more expensive than others, and I wasn't completely sure how much it helped, as the few times I have used it so far have been on abnormally..." Read more

"...for hotels because not all hotel sheets are created equal, totally worth the money.Plan on buying another for my mom" Read more

"...Now for the downside..... it's expensive but let's face it sometimes the comfort is worth it...." Read more

Great liner and very comfy
5 Stars
Great liner and very comfy
I bought a sub zero sleeping bag and tried it without the liner first to see how warm it would keep me in 18° weather. I also had a barrier between me and the ground. The sleeping bag did not keep me warm. But after I put this on I am Immidently felt much warmer and it kept me Comfortable throughout the night. I would definitely recommend this even though it does cost a fe comfortable throughout the night. I would definitely recommend this even though it is expensive
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Top reviews from the United States

Mich
5.0 out of 5 stars Comfort & Warmth
Reviewed in the United States on January 17, 2024
Style: Regular (83 X 35)Verified Purchase
Took this on my first backpacking trip to Death Valley in January (3 nights). It was colder than expected. The second night so cold our water froze. This liner not only made my sleeping bag cozy but added every bit of extra warmth advertised and some. Well worth the extra money and space in the pack. This will be a staple piece of my sleeping gear even in warmer weather - it adds that extra bit of comfort and to any sleeping bag. I also love the lining between dirty, several days into the trip body and the sleeping bag. It’s super easy to toss the liner in the wash and keeps the sleeping bag from having to be sent out for cleaning after every trip.
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JFP
5.0 out of 5 stars Saved the day!
Reviewed in the United States on September 2, 2023
Verified Purchase
Bought this for my backpacking sleep system but wound up first using it in a pinch following a move where my stuff didn’t arrive. I had no bedding and my sleeping bag was inaccessible. So I had to use for couple nights and it was comfy and warm. Really impressed with performance given the weight and compact storage. Can’t wait to use this on the trail. Passes the test in my book.
6 people found this helpful
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Ari
5.0 out of 5 stars You need this if you camp in winter/early spring
Reviewed in the United States on March 9, 2024
Style: Fleece (79 X 28)Verified Purchase
O.M.G. This was a life saver on a winter backpacking trip. If you want to camp in the cold, you NEED this liner. It’s warm, cozy, easy to use, easy to clean…. My dog got into my sleeping bag with me and it’s safe to say that she approves too!
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Mason Firpo
4.0 out of 5 stars Good option
Reviewed in the United States on January 3, 2024
Style: Extreme (83 X 35)Verified Purchase
Got of a recent winter camping trip and feel like it did add some warmth to my 20 F degree bag. It’s very soft and light weight. I’m more looking forward to using it backpacking during the summer since my 20 F bag is overkill where I live and way too hot.
2 people found this helpful
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owen l tucker
5.0 out of 5 stars I love it for my LW bag
Reviewed in the United States on March 1, 2024
Style: Regular (83 X 35)Verified Purchase
I try to go light weight and use a snugpak jungle bag and this is great for some extra warmth.
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Amazon Customer
5.0 out of 5 stars Pleased with the item but…
Reviewed in the United States on April 23, 2023
Style: Extreme (83 X 35)Verified Purchase
Really satisfied with the feel of the material, the durability, and effectiveness of the bag liner. I got the extreme version because I wanted to be able to pair it with my 20° bag and get more range and extend its life. I also planned to use the bag liner as a hot summer night sleeping bag. It’s also much easier to wash than a sleeping bag. So it’s nice to use on trip you might be rolling a little grubby.

Turns out my favorites use for it is as a summer bag. It’s very small when packed compared to a sleeping bag and works well to keep you comfortable on a backpacking or bikepacking trip on warm nights. It also works well as a bag protector with added warmth to my -20° winter bag. Allowing you to sleep without base layers if that’s your thing.

It does not however extended the range of my 20° bag. So if you’re thinking to buy this to push your 20-30° bag to a 0° then I suggest putting them money towards a proper 0° instead. Sleeping outside in zero degrees is really cold and while this helps a bit, it doesn’t make up for the right gear for the job.
22 people found this helpful
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wwengren
5.0 out of 5 stars Let me carry less weight
Reviewed in the United States on November 4, 2023
Style: Regular (83 X 35)Verified Purchase
This allows me more flexibility with my sleeping bag. When I need the extra warmth, there it is! It takes up a small amount of space. Perfect for my purposes.
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JPM
5.0 out of 5 stars keeps your bag clean and you warm
Reviewed in the United States on October 22, 2023
Style: Extreme (83 X 35)Verified Purchase
During summer camping this might be all you need. In fall and winter I bring it to keep my sleeping bag clean and to keep me a little extra toasty. It is comfortable, light and easy to wash.
3 people found this helpful
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Top reviews from other countries

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Manoel
5.0 out of 5 stars Line para dormir bem.
Reviewed in Brazil on April 7, 2024
Style: Regular (83 X 35)Verified Purchase
Para fazer trilhas, peregrinações ou caminhadas com locais para dormir programados, o line é uma excelente opção, pois seu peso é pequeno, ocupa pouco espaço e aquece bem com pouco frio.
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Client d'Amazon
5.0 out of 5 stars Calor
Reviewed in Spain on April 1, 2024
Style: Regular (83 X 35)Verified Purchase
Funciona bien
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Pasi Mammela
4.0 out of 5 stars Lättvikt
Reviewed in Sweden on March 2, 2024
Verified Purchase
Rymlig oh lättvikt men också tunn, vet inte om jag skulle använda det utomhus i en tält eller liknande, då får det allt vara varmt väder...
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Ugo de Veredicis
5.0 out of 5 stars Ottimo prodotto a prezzo conveniente
Reviewed in Italy on February 27, 2024
Style: Fleece (79 X 28)Verified Purchase
super compatto e caldissimo!! ci dormo in un limit 10 gradi anche a 0 gradi, fa il suo lavoro
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peter sands
5.0 out of 5 stars Warm
Reviewed in the United Kingdom on January 31, 2024
Verified Purchase
It makes all the difference
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