A Guide to the Best & Warmest Sleeping Bag Liner of 2019

Camping out is great, but having to deal with a cold sleeping bag isn’t. If you want to make your sleeping bag that little bit more comfortable and warm, then you should consider a sleeping bag liner. I can tell you that a sleeping liner can make a significant difference. Personally, it has helped me, and my camping friends have a much more enjoyable sleeping experience. The warmest sleeping bag liner is a great way to add some protection and warmth to your camping experience. Not to mention, they can improve the durability and longevity of a sleeping bag. Here’s a look at some of the best sleeping bag liner options of 2019.

Best Overall – Warmest Sleeping Bag Liner

Extreme Thermolite Sleeping Bag Liner Sea to Summit Reactor

To get things started, we present you with the best overall sleeping bag liner. The Sea to Summit Reactor sleeping bag liner is an excellent thermal sleeping bag liner that adds extra warmth in even the coldest conditions. This lightweight bag liner offers surprisingly comfortable results. It is small and light enough to fit in a backpack for a short hike. This all goes together to give you the best overall choice for warmest sleeping bag liner. It’s best to use it with a mummy-style sleeping bag.


“Before using the item: Very cold, unable to sleep. After applying the item: Nice and toasty.”

The liner is small and lightweight, and it rolls up comfortably small. It keeps your bag clean and lets you move around and even turn over in the night without having the bag turn with you. It’s super easy to wash and dry but avoid drying it in intense heat. Don’t dry it over an open fire out in the field, for example. It can melt if exposed to too much heat.


  • Lightweight and good for hiking
  • Flexible and comfortable
  • Best choice for thermal sleeping bag liner


  • Can get too warm – only suited for very cold temperatures

Closing Thoughts

This is by far the most comfortable and warmest sleeping bag liner to buy in 2019. Many customers have been astounded at just how effective it is at raising the temperature. The lightweight design makes it incredibly portable and suitable for a range of outdoor activities. I can personally say that this a sleeping bag liner that fulfills all the requirements.

Best Value for Money

ALPS Mountaineering Microfiber Liner 

Retailed at only $16.99, this next pick represents the best value for your money. If you like to go camping or climbing in the winter, then you also understand it’s important to get a light option. Weight can be the enemy of every hiker. You sometimes have to choose between being comfortable at night or light during the day. The good news is that the ALPS Mountaineering sleeping bag liner means that won’t be a problem. You don’t need to choose between them anymore. It adds a good 5F of warmth to a sleeping bag while taking very little space inside your bag.

ALPS Mountaineering Mummy Liner

The cheapest of the lot. But also the lightest.

One thing to watch out with this bag is that it opens from the left rather than the right. If you’ve got a bag that opens from the right, then it could be uncomfortable. With that said, it still keeps out the elements and has a lot of room. Despite the size, it packs up to around the size of a can of soda when packed up. This makes it flexible and convenient for many uses.


  • Microfiber offers breathable comfort
  • Holds warmth well
  • Washable


  • Snug – may be a tight fit

Closing Thoughts

If you are looking to get the most bang for your buck, then this is a sleeping liner that you must seriously consider. It is incredibly lightweight and does well at its primary role of keeping in warmth. Moreover, it is very breathable, and customers have noted that it is exceptionally comfortable.

Best Insulation

Osage River – Warmest Sleeping Bag Liner

Now, I know that some of you will want a sleeping bad that provides the best insulation. Do you want the warmest sleeping bag liner that looks good, feels good, and fits perfectly around your body? If so, then you should choose a fleece or cocoon silk option like the Osage River.


This liner doesn’t add a lot of weight to your backpack, and it can be fitted into your bag without a problem. Even so, it is easy to use thanks to a zipper, and it adds a lot of extra warmth to your sleeping bag. You can even open it up all the way and use it for a blanket if you want. The high-quality construction offers a feeling of comfort and warmth with every use.

The Osage River is designed to open out to six feet but pack up to just six inches when packed up. It only weighs around a pound as well, making it super comfortable and portable, not to mention lightweight. The bag is a great thing to take with you on camping and backpacking events. It’s also a good addition for an outdoor concert in the cold.


  • Super comfortable
  • Can be used as a blanket
  • Made with microfiber fleece
  • Itchy-free


  • Could be better for freezing conditions

Closing Thoughts

Overall this is a fantastic and versatile sleeping bag liner that will ensure you get the best sleep. It is easy to carry due to the lightweight design, and the microfiber construction is incredibly comfortable. Many customers have noted how impressed they were with the softness and insulation on offer. You can be just like them by purchasing this brilliant sleeping bag liner.

Most Comfortable

TETON Sports Liner  

Comfort is king, as they say. So far, our list has picked out some incredibly comfortable sleeping bag liners. However, if you want the most comfortable sleeping bag liner on the market, then you should definitely consider the next one on our list. The TETON Sports Liner is a double sleeping bag liner that offers supreme comfort. It’s one of the best options out there for people who have space in their backpack for something this big.


The most comfortable for our list of warmest sleeping bag – TETON Sports Liner

The liner is available in cotton and polyester, and it is friendly for sensitive skin because it shouldn’t cause itching. It adds some extra degrees to any sleeping bag, making it ideal for use in colder climates where you need that extra warmth. The size is a bit of an issue because it makes it bulky and it takes a while to dry, so keep that in mind.

One thing that customers have warned about is the size of the liner. Some people might find the “regular” size to be a little small. Double check the size you are buying before making a purchase to be sure you’re getting a good fit.


  • Fully washable
  • Can be packed into a smaller size
  • Easy to climb into and out of


  • Takes a while to dry fully after washing

Overall, if comfort is your key priority above all else, this is simply the elite sleeping bag liner option for you. It may not be as lightweight as the rest, but it does offer supreme comfort. Many customers noted that they got the best night’s sleep ever in this sleeping bag liner. The choice for you is therefore simple. If you demand the highest comfort possible, then you must go for the Teton sports liner.

Best Lightweight Option

Bundle Monster

If you are in search of something that is lightweight, then you will be interested in this selection. This sleeping liner does offer a lot of extra comfort on a cold night. The zipper on the liner opens it up so that it can be used as a blanket. It’s also possible to get an extra Bundle Monster bag and zip two of them together to create an even bigger blanket or sleeping bag liner. One big downside of this option is that it isn’t waterproof. You’ll need to be careful to keep it out of the rain. That shouldn’t be an issue if you have a waterproof tent and bag, though. Just keep the liner packed until you’re ready to use it in the tent.


The lightweight option among the warmest sleeping liner – the Bundle Monster

The liner offers up to 10 degrees of extra warmth. It’s a great little sleeping bag by itself but serves best as a liner. One slight issue is the size. It’s recommended that you get some extra compression socks to reduce the size of the package. It does come with a bag, but it’s not enough to compress the blanket fully.  Many customers have noted how impressed they were with the lightweight qualities of this sleeping bag liner. The compression works well, which means you will have plenty of space for other things.


  • Versatile
  • Small after being packed
  • Can be unzipped to form a blanket or zipped together to another sleeping bag liner


  • Not good in humid conditions

Closing Thoughts

Overall, if you’re looking for something comfortable and lightweight, then this is definitely the sleeping liner for you. If you pick this sleeping liner, then you get the best of both worlds in terms of comfort and portability.

Best Silk Sleeping Bag Liner

Marycrafts Single 

If you want a more premium and luxurious feel to your sleeping bag liner, then you should definitely consider it once made from silk. If you feel like being fancy with your sleeping bag and want a silk travel sheet, then what you want is the Marycrafts Single Sleeping Bag Liner. What you’ve got here is the Rolls Royce of sleeping bag liners. It comes in 100% Mulberry Silk to offer a unique and special feeling when you’re wrapped up inside it. The liner offers plenty of airflow so that it can be used in warm weather as well as cold weather. It’s also surprisingly small and packs up really well. Stick it in the machine to wash it and have it dry out in no time at all.


The Maryrafts sleeping bag liner gives  you the premium feel

Just keep in mind that it’s not the warmest sleeping bag liner out there. The silk is fairly thin too, even for silk. It can also be difficult to clean because of it. You’ll need to take gentle care of it but the results are worth it because it looks and feels amazing. This one is more about style than substance – and some people will be more than happy with that. It’s not for everyone though.


  • 100% Mulberry silk
  • Easily washable
  • Dries quickly


  • Not great for cold weather

Closing Thoughts

Function is always essential, and this is a sleeping bag liner that is both lightweight and comfortable. However, the silk material provides a wonderful luxurious feel. In terms of pure aesthetics, you simply cannot get any better than the Marycrafts 100% pure silk sleeping bag liner.

The Wrap Up

There you have it, my top 6 warmest sleeping bag liner. If you are looking for a sleeping bag to go with it, check out our reviews of the best 0 degree sleeping bag. For my needs, I will probably go with the Teton Sports Liner, extremely comfortable and warm, and I don’t mind carrying a little extra weight. A good night sleep is my top priority for any kind of outdoor activity. For most people, the Extreme Themorlite by Sea to Summit will be a more balanced choice between comfort and price.