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The Thermolite Reactor Compact Plus increases sleeping bag performance by up to 11C. Specific panelling of 110g/m Thermolite in core body and foot bed areas adds heat, with 80g/m Thermolite elsewhere to keep the weight down. The ergonomic design shaves off excess weight and bulk for a snug fit. Ideal for lightweight backpackers under 6ft tall.
Set Contains:
1 x Sleeping Bag Liner
Theo Ververgaert
Reviewed in Germany on May 4, 2025
Voelt heel aangenaam aan en niet broeierig. Scheelt een paar graden in een te koude Slaapzak. Blijft mooi na het wassen. Voor mij echt een uitkomst.
Rina
Reviewed in the United States on December 29, 2024
I purchased this for my Camino de Santiago pilgrimage knowing I’d be sleeping in hostels. It is advertised as 5-7 degrees warmer than room temperature. Not the case. Did not feel any warmth at all. Not worth it all for the price. It’s very thin. Packs well but that’s the price to pay - provided no warmth.
Cara Lucia
Reviewed in the United States on August 28, 2023
I just bought one of these after trying my spouse’s over the weekend. I should have gotten a slightly warmer sea to summit ultralight bag (spark). It’s a great sleeping bag for summer backpacking packing down to the side of a water bottle. What I failed to take into account is that I would be using it 90% of the time in the Rocky Mountains at 8,000 plus feet- usually pretty chilly- often freezing overnight even in the summer. My butt is cold when I sleep in my side because the ultralight bags have less down in them. So since I didn’t get a slightly warmer bag and I cannot drop another $400 one one- this liner does the trick. I also use a silk liner because my skin does not do well with synthetics. While two liners in a bag is not ideal…. It wasn’t much different than just having one liner in terms of “liner management” when turning over and about inside the bag overnight. I was plenty warm and dry with the silk liner and this liner during a night of cold downpours. I wish I didn’t have to carry an extra liner….. but it really does what it was meant to do, it’s light and even when combined with my ultralight bag it’s still smaller in the pack than most sleeping bags. I really like the idea that I can use it on its own with just the silk liner on warmer nights too. Only complaint is that sea to summit is grossly over priced…. Excellent quality products but they are ALL a bit greedily priced in my opinion.
August
Reviewed in the United States on October 5, 2023
1. ❤️❤️❤️❤️❤️Delivery; I'm really impressed, with how the Summit Reactor Insulated Sleeping Bag Liner was delivered. It arrived one day after I placed the order and everything was in condition.2. ❤️❤️❤️❤️🤍 Quality; The craftsmanship of this product is truly impressive. The fabric feels incredibly soft with a silky and cool texture. The liner as a whole is impressively lightweight and compact making it super easy to pack and unpack. However, I do have a concern when it comes to the fabric thickness for my use, which is protecting my skin from hotel beds. Even if I were to use it for camping or other purposes I still think it's a bit too thin for sleep.
Andrew hamilton
Reviewed in the United States on September 19, 2021
I purchased this from my local camp store in hopes of raising the comfort rating of my warm weather sleeping bag (45 degree marmot sleeping bag) and I thought I could get this to just add some warmth for an upcoming backpacking trip where Temps will be in the 40s.Well, I tested this liner last night since the Temps dipped below 50. I did sleep in only my underwear trying to really test out the warmth, well I was pretty cold. I almost always sleep with my bag unzipped except last night I zipped it up after laying there for a couple hours and even pulled the hood over my head and was still cold. By 4am I was putting on insulated tights and some wool socks (which I had taken with me just in case I did get cold) this liner definitely does NOT provide the advertised warmth rating , it might increase your sleeping bag by 3° , certainly not 11.Now on to the rest of my sleep set up so people can see what else this liner was paired with. I had my Klymit insulated static V sleep pad with insulated V quilt, sea to summit aeros premium pillow, marmot nano 45 and this S2S reactor compact plus (didn't realize it was compact until I got it, luckily I'm short or it wouldn't work. I'm 5'8 and its barely long enough to get the hood over my head) so my sleep system was all cold weather rated except for my sleeping bag.Honestly the only thing I see this liner being good for at all - is helping keep the inside of your sleeping bag / quilt clean
Sammy
Reviewed in the United Kingdom on August 25, 2021
When hiking I carry a tiny Naturehike summer sleeping bag, it only has a comfort temp of 15 degrees C. I like to carry this liner just incase the temperature drops lower than expected or I just find myself getting chilly. It does seem to work, I can't spread out like a starfish in it but I just sleep on my side instead. It is soft and comfortable.- Also, if it is not cold enough to want to get in it. I put my sleeping pad inside it, it acts like a fitted sheet so the pad is more comfortable on the skin. Which makes this an item I can use all year round.
Andrea26
Reviewed in Italy on August 11, 2021
Marchio=garanzia.Attenzione alla vostra altezza: io sono 1.86 e ovviamente sporgo ben oltre la fine del sacco con la testa.Problema che per il mio utilizzo non sussiste ma per altri…In ogni caso ottimo sia da solo che abbinato al sacco a pelo.Speriamo che l’ inverno in quota sia più confortevole ora
alvaro
Reviewed in Spain on February 16, 2021
Por el precio me esperaba más, no aporta 11°C ni por asomo, quizás 5 pero es hablar mucho.Es ligero, da más comodidad en el saco y facilita el aseo del saco haciendo que sufra menos con sudor y aceites corporales.Yo lo voy a usar mucho con sacos ligeros, pero el precio es excesivo.Si costara 15-20€ sería perfecto. Por el doble es una sábana saco algo elástica muy subida de precio
frederic perrier
Reviewed in France on November 8, 2019
Le meilleur.
Fishsqueezer102
Reviewed in the United States on October 8, 2014
Very light weight and warm. Great for backpacking and gives you a little extra warmth. Not sure it increased the warmth of your bag by 20 degrees though.
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