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Best Sleeping Bag Liners of 2023
This post was last updated on December 06, 2023.
For those in the know, there's nothing quite as satisfying as unrolling the perfect sleeping bag liner in your tent after a long day on the trails. That's why we're here to help you sift through the chaff and find the cream of the crop. Initially, you might think a liner's just a liner, and any will do. We're here to tell you - that's not quite right.
When it comes to staying snug on your outdoor adventures, the Sea to Summit Reactor Extreme Thermolite Liner has our vote as the ultimate pick. Offering unrivaled levels of comfort, body warmth, and design durability, this game-changer is a must-have piece of gear. Though the main character of our story, it's not stealing the whole spotlight. We've also identified two runners up and top choices for those looking for something ultra-light or on a budget.
Before we get into the nitty-gritty, we'd like to acknowledge that sleeping bag liners can be a personal preference. It heavily depends on the type of camper you are, as well as the conditions you're heading into. That's why in our evaluations, we've considered a range of factors from warmth and insulation enhancement to durability and value. Wanting to know more about sleeping bags themselves? Check out our detailed reviews and top picks in our related articles on Best Camping Sleeping Bags, Best Backpacking Sleeping Bags, and Best Backpacking Sleeping Bags for Women.
Our Top Recommendations
Our Top Pick
Sea to Summit Reactor Extreme Thermolite Liner
The Sea to Summit Reactor Extreme Thermolite Liner is the top pick because users highly praise its impressive warmth boost and the cozy, soft lining, surpassing other liners with its comfort and durability.
Runner Up #1
Sea to Summit Coolmax Adaptor Liner
The Sea to Summit Coolmax Adaptor Liner stands out as the top pick runner up thanks to its remarkable breathability and sweat-wicking properties that users rave about, alongside its compact and lightweight design that makes it a backpacking favorite.
Runner Up #2
Nemo Tracer Sleeping Bag Liner
The Nemo Tracer Sleeping Bag Liner nabs the top pick runner up spot for its praised moisture-wicking material and roomy design, as celebrated by campers who love its comfort and performance in keeping them dry and cozy from sundown to sunrise.
What you should look for
(and what we test for)
Warmth
Find a liner with a good warmth-to-weight ratio - it should offer substantial insulation to boost the temperature rating of your sleeping bag without adding unnecessary weight to your backpack.
Material
Always look for a sleeping bag liner made of breathable and moisture-wicking fabric like silk or coolmax, this will keep you comfortable and dry in any weather.
Size and Weight
Consider the size and weight of the liner - it should be light enough for easy carrying and spacious enough to allow unrestricted movement during sleep, which will be especially important for multi-day hikes or climbs.
Ease of Cleaning
Opt for a liner that's easily washable - you ideally want a machine-washable one, which will help to keep your sleeping bag fresh and free from dirt and body oils when you're out in the wilderness.
Sea to Summit Reactor Extreme Thermolite Liner
$74.95The Best Sleeping Bag Liner
Based on our research and testing, we think the Sea to Summit Reactor Extreme Thermolite Liner is the best Sleeping Bag Liner on the market right now, for anyone looking to play hard outside.
Reasons to Buy
- Great Insulation Boost
- Keeps Sleeping Bag Clean
- Versatile for Different Temperatures
- Compact and Easy to Pack
Reasons to Avoid
- Relatively Expensive
- May be Too Warm for Some Users
- Tight Fit
The Important Specs
- Material: 110g/m² Thermolite fabric
- Dimensions: 84 x 36 inches
- Packed Size: 3 x 5 inches
- Temperature Rating: Adds Approx. 25°F
Review Roundup
The Sea to Summit Reactor Extreme Thermolite Liner certainly lives up to its name. Perhaps the first thing you'll notice when you get your hands on it is how incredibly light and packable it is. Measuring only 4 x 6 inches when packed, it's about the same size as a small water bottle, making it a breeze to carry along on all your camping and backpacking trips.
Beyond its very portable design, the Thermolite Liner does an excellent job at providing a substantial increase in warmth. You can comfortably use this liner alone in relatively mild climates or combine it with a standard sleeping bag when bracing for colder weather - it's the perfect accessory for those who like to camp or backpack in a range of conditions.
Many customers have praised the way this liner boosts the warmth of their sleeping bags. In fact, most claim they've experienced up to 25°F of additional warmth, which is a major plus for any camper or backpacker trying to beat the chill. What's more, this liner features hollow-core fiber construction, which traps heat and reduces heat loss, thereby ensuring your nights in the wilderness are as cozy as possible.
Durability is another strong suit of the Sea to Summit Reactor Extreme Liner. Made with high-quality Thermolite fabric, it's capable of withstanding the rigors of the great outdoors, but still remains soft to touch. It's also machine washable, making it convenient to clean after your outdoor adventures.
On the flip side, some users have noted that this liner may feel a bit constricting, especially for those who are taller or have a larger build. The mummy shape, while excellent for retaining heat, can prove restrictive to some. That said, this is a common issue across most liners in the market and may not be a deal breaker, especially considering the toasty warmth it grants in return.
All in all, the Sea to Summit Reactor Extreme Thermolite Liner is a top-notch choice for an extra layer of warmth and comfort on your camping trips. With hundreds of positive reviews, it seems that many outdoor enthusiasts agree on its standout performance.
Durability
Made of durable Thermolite material, the Reactor Extreme Liner is designed to withstand frequent use and outdoor wear and tear. However, some users mentioned that care needs to be taken while inserting and removing it to avoid ripping, especially when used inside smaller sleeping bags.
Material & Comfort
The Reactor Extreme liner is made from soft, breathable fabric, offering a comfortable sleeping environment. The addition of a stretchy, drawcord hood keeps your head insulated and comfortable throughout the night. Some users, though, have noted the liner can be a bit snug, which isn't great for those who prefer more room to roll around.
Size & Fit Variety
The dimensions of this liner offer a decent amount of room for most users, though folks with a larger build or those who toss and turn may find it a bit restricting. Additionally, some users have cited the lack of a side opening as a minor inconvenience.
Value
While it sits on the pricier end of the liner spectrum, its unique warmth-to-weight ratio and material durability make it a worthwhile investment, particularly for those venturing into colder climates. The trade-off between cost and comfort here seems to fall in favor of the Reactor Extreme for most campers.
Warmth & Insulation Enhancement
The Sea to Summit Reactor Extreme Thermolite Liner is a great solution for boosting the warmth of your sleeping bag. Its Thermolite fabric can reportedly increase the temperature rating of your sleeping bag by up to 25°F, making it a perfect companion for cold weather camping. However, some users have reported it can get a bit too warm in milder temperatures.
Weight
The Reactor Extreme isn't the lightest liner on the market, but with its added warmth benefits, it's surely the weight-to-warmth champion. It's still lightweight enough to be carried on multi-day hiking trips without causing much hassle.
Prices
Sea to Summit Coolmax Adaptor Liner
$59.95Runner Up
Based on our research and testing, we think the Sea to Summit Coolmax Adaptor Liner is a great choice if you're looking for a sleeping bag liner to go play hard outside with, if our top pick isn't quite what you're looking for.
Reasons to Buy
- Versatile use in various climates
- Good moisture-wicking ability
- Includes a carrying pouch
- Comfortable to sleep in
- Easy to clean, may be machine washed
Reasons to Avoid
- Slightly pricier than its competitors
- May not significantly increase warmth in very cold conditions
- No zip for easy access or exit
The Important Specs
- Material: 100% Coolmax polyester
- Dimensions: 82 x 36 inches
- Other Features: Mummy shape, comes with its own stuff sack
Review Roundup
Straight off the bat, the Sea to Summit Coolmax Adaptor Liner is a standout for anyone looking to add an extra layer of coziness and warmth to their camping setup. Its unique Coolmax fabric technology is praised by users for effectively wicking moisture away, keeping you cool and dry throughout the night.
User feedback consistently highlights the liner's versatility, suitable for use in differing conditions, from chilly mountain forests to warmer, humid evenings by the sea. Its design also incorporates a convenient mummy shape with a box foot, earning it praise for its comfort and flexibility.
The no-fuss, easy-care approach is another draw for campers of all kinds. The ability to just toss it in the washing machine after a long trip is a feature frequently mentioned in user reviews. An added bonus is the lightweight packaging that doesn’t overcrowd your backpack, which most backpackers find particularly useful.
However, it’s not all sunshine and roses. There are some points buyers occasionally grumble about. Among these are the relative narrowness of the liner, with some users mentioning they wish it had a bit more wiggle room. Additionally, some people suggest the Coolmax fabric, while breathable and moisture-wicking, can feel a bit 'scratchy' or 'synthetic' against the skin.
Lastly, several users wished there was a way to securely attach the liner to their sleeping bag. After a night's toss and turn, some wake to find the liner has twisted or bunched up inside their sleeping bag. This doesn’t seem to be a deal breaker, but rather something to improve upon in future iterations.
In a nutshell, the Sea to Summit Coolmax Adaptor Liner seems to be ticking a lot of the right boxes: warmth, versatility, easy care. Some minor gripes do exist, but it would appear that its pros far outweigh the cons among its users.
Durability
In terms of durability, many users have attested to its long-lasting nature, even with regular use. The liner holds its shape and integrity well, even after several machine washes.
Material & Comfort
The liner is made of 100% Coolmax polyester, which many users have praised for its soft and comfortable touch. The Coolmax material is also notable for its moisture-wicking properties, so you won't wake up with a case of stickiness or sweatiness even on warm nights.
Size & Fit Variety
The liner comes in size of 82 x 36 inches. It's spacious and comfortable for most people but might be slightly restrictive for larger individuals. However, its mummy shape can accommodate pretty much any sleeping bag style.
Value
Although the Sea to Summit Coolmax Adaptor Liner is somewhat on the pricier side compared to other liner options, customers who've bought and used it often reason that its quality and durability justify the extra spend. In the long term, this liner, with careful use and maintenance, could prove to be a valuable addition to your camping gear.
Warmth & Insulation Enhancement
Considering the Coolmax Adaptor Liner's main job is to enhance the warmth and insulation of your sleeping bag, it does pretty well in moderate temperatures. However, some users have reported that in extremely cold conditions, the liner doesn't contribute significantly to warming. With that said, it still offers a moderate upgrade and should suffice for summer or spring camping trips.
Weight
While we're not focusing on weight in this review, it's worth mentioning that it's lightweight and packable, great for backpacking trips.
Prices
Nemo Tracer Sleeping Bag Liner
Runner Up
Based on our research and testing, we think the Nemo Tracer Sleeping Bag Liner is a great choice if you're looking for a sleeping bag liner to go play hard outside with, if our top pick isn't quite what you're looking for.
Reasons to Buy
- Boosts the warmth of your existing sleeping bag
- Breathable yet insulating material
- Great size variety to fit a range of sleeping bags
- Durable build yet lightweight
- Good value for the quality offered
Reasons to Avoid
- May be slightly pricey for budget seekers
- Lighter color options may show dirt easily
The Important Specs
- Material: Brushed polyester
- Dimensions: Unpacked: 82 x 36 inches, Packed: 8 x 5 inches
- Compatibility: Works with most regular and mummy-style sleeping bags
- Temperature Range: Adds approximately 10F extra warmth
Review Roundup
If you're a high-altitude camper or someone who feels the chill easily, the Nemo Tracer Sleeping Bag Liner might just become your new best friend. A high-end product designed for maximum warmth, this liner adds an extra layer of insulation and comfort to any sleep setup.
The Nemo Tracer is crafted with synthetic silk, providing a luxurious, soft feel against the skin. It's like sleeping on the finest hotel sheets, except you're under a canopy of stars - what's not to love?
One thing that stands out about this sleeping bag liner is its breathability. Often, liners can tend to trap too much heat, leading to a sweaty, stuffy sleep experience. However, the Nemo Tracer balances warmth with ample ventilation, making sure you're just the right level of toasty.
However, some users pointed out that this liner is a bit bulkier compared to other options. It takes up a small amount of extra space in your pack, which might be a crucial factor for minimalist hikers. But on the flip side, if you value comfort over pack weight, this minor issue won't bother you.
Something unanimous among users is the ease of use of the Nemo Tracer. This liner slips easily into sleeping bags of all sizes, and it also comes with a handy stuff sack for easy storage - a little detail, but it makes a world of difference when tidying up the camp in the morning hurry.
Lastly, the durability of the Nemo Tracer won praises across the board. Reinforced seams, high-quality synthetic silk, and a robust design mean you can depend on this liner for many camping trips to come. Of course, it does come at a slightly premium price point, but considering its long-term strength, it can be a worthwhile investment.
In a nutshell, the Nemo Tracer Sleeping Bag Liner is a warming, comfortable, and reliable camping accessory. Its bulkier size might be a slight downer for lightweight backpackers, but its soft synthetic silk material, breathability, easy use, and durability make it a worthy consideration.
Durability
Most of the online reviews commend the Nemo Tracer for its durability. The stitched seams and trim have survived numerous camping trips and machine washes, according to many users. Resilient and long-lasting, this liner is constructed to serve you well for lots of trips to come.
Material & Comfort
Boasting a brushed polyester fabric that's soft against your skin, the Nemo Tracer scores well in the comfort department. Users have complimented the material for resisting bunching-up, which is a common problem with many liner materials. While the liner is soft and plush, it remains breathable to prevent excessive sweating during the night.
Size & Fit Variety
Whether you're using a regular or a mummy-style sleeping bag, the Nemo Tracer fits well with a variety of sleeping bag sizes. According to online reviews, its size is versatile and accommodates taller users too. When not in use, it packs down into a fairly compact size, making it easy to carry around.
Value
Although it might be slightly more expensive than other liners on the market, many users feel the Nemo Tracer Sleeping Bag Liner offers great value. With its durability, comfort and additional warmth, it enhances your sleeping bag's performance while serving as a standalone layer in warmer weather.
Warmth & Insulation Enhancement
The Nemo Tracer Sleeping Bag Liner definitely adds a level of warmth to any sleeping bag. Users frequently praise its ability to add approximately 10F additional thermal insulation, which can make all the difference on colder nights out under the stars. Its brushed polyester material seems to retain heat well while also being breathable, keeping you comfortably warm without feeling stuffy.
Weight
The Nemo Tracer Sleeping Bag Liner is in the lighter spectrum of sleeping bag liners, despite its considerable performance in warmth enhancement. Though we don't have the specific weight, users highlight the liner's lightweight nature and the minimal impact on their overall backpack weight.
Prices
No prices found. Check back later!
Cocoon CoolMax Mummy Liner
$54.95Best Budget Sleeping Bag Liner
Based on our research and testing, we think the Cocoon CoolMax Mummy Liner is a great pick if you're looking for a sleeping bag liner that is more budget friendly, without sacrificing too much in quality.
Reasons to Buy
- Affordable
- Good for mild weather
- Quick drying
- Breathable material
Reasons to Avoid
- Not suitable for very low temperatures
- Might feel tight for larger individuals
- Doesn’t include a stuff sack
The Important Specs
- Shape: Mummy
- Length: 220 cm
- Material: CoolMax Polyester
Review Roundup
The Cocoon CoolMax Mummy Liner is a definite winner when it comes to getting value for your money. It offers a level of comfort and performance that often surprises, considering its reasonable price tag. With its lightweight design, it is highly appreciated by campers who prefer to pack light without compromising on essential comfort.
This liner, designed in a mummy-shape, innovatively uses a CoolMax technology that helps to wick away sweat and keep you cool during those warmer nights. It's a blessing for those who have experienced waking up drenched at the break of dawn on a hot summer's day on a camping trip. Also, the handy side opening with Velcro closure adds to its convenience.
When it comes to durability, the Cocoon CoolMax Mummy Liner doesn't disappoint. Many outdoor enthusiasts who bought this product praised its robustness and long-lasting nature. The stitching is durable and the fabric is resistant to tearing, making it a reliable companion for your frequent adventures.
The washability of the liner has also received positive feedback. It is machine-washable, which takes the pain out of keeping it clean after particularly muddy or dusty expeditions. However, a few users have mentioned that it tends to be static-prone, which can be a minor annoyance.
Although it is not designed to provide significant warmth, it does add a few degrees to your sleeping bag, making it ideal for use in mildly chilly weather. On colder nights, however, some users felt the need for additional insulation.
Another slight drawback mentioned by a small proportion of users involved the liner's size. While it was a great snug fit for some, taller or larger individuals found it a little tight. Therefore, if you're on the taller or larger side, you might want to look into this aspect before purchasing.
Despite these minor gripes, the Cocoon CoolMax Mummy Liner is praised for its packability. It folds up neatly into its compact stuff sack, which is small enough to be easily stashed in a backpack. Most users agree that this liner offers great bang for your buck, providing an extra bit of comfort and cleanliness to your camping experience - without the weight or the strain on your wallet!
Durability
Users found the liner quite durable thanks to the quality polyester construction. It stands up relatively well to regular use on the trails, thus making it a reliable companion for regular campers or backpackers.
Material & Comfort
The liner is manufactured from 100% CoolMax polyester, providing a soft, comfortable feel against the skin. Its breathability is an added bonus, especially in humid climates.
Size & Fit Variety
With a mummy shape that measures 220 cm in length, it suits most campers comfortably. However, some users who are a bit on the larger side have expressed that it might feel tight fitting.
Value
The Cocoon CoolMax Mummy Liner ranks as a budget favorite partly due to its competitive price point. Its affordability coupled with its decent features gives you value for money, especially if you’re looking for a basic liner for occasional use.
Warmth & Insulation Enhancement
This liner might not fulfill your needs if you are looking for something to cope with harsh winter conditions. However, the CoolMax Mummy Liner is still a good pick for slightly cool conditions thanks to its CoolMax technology fabric.
Weight
What makes the Cocoon CoolMax Mummy Liner stand out from its counterparts is its feather-light nature, but take note that the lightness doesn't quite translate into ultra warmth.
Prices
Sea to Summit Spark Ultralight Sleeping Bag Liner
Best Ultralight Sleeping Bag Liner
Based on our research and testing, we think the Sea to Summit Spark Ultralight Sleeping Bag Liner is a solid choice for those looking for a lightweight sleeping bag liner option to go play hard outside with.
Reasons to Buy
- Super breathable material
- Enhances sleeping bag temperature
- Comfortable to sleep in
- Compact and easy to pack
Reasons to Avoid
- May not fit larger sleeping bags
- A bit expensive compared to other liners
The Important Specs
- Material: Premium ultra-light, breathable Ripstop 15D Nylon
- Dimensions: 85 x 36 x 28 inches
- Bag Compatibility: Mummy Sleeping Bags
- Temperature Enhancement: +5 degrees Fahrenheit
Review Roundup
The Sea to Summit Spark Ultralight Sleeping Bag Liner has really created a buzz among camping and backpacking enthusiasts. With a focus on reducing the load you carry, this liner is a super choice for travellers who aim to keep their backpack light. Certain key features make this product a hit among the ultralight crowd.
One of the things that shines out about this liner is its weight, or lack thereof. It tips the scale at a featherlight 2.5 ounces, which won't add any significant weight to your pack. Everyone knows, when you're hitting the trails, every ounce counts.
Another talking point is its construction material. Made from a smooth and lightweight ripstop nylon fabric, it offers durability without being weighty. So, it can last through multiple camping trips without ripping or tearing.
The Sea to Summit Spark Liner also seems to excel in the comfort department. Several online reviewers have mentioned how soft to the touch it feels, giving them an extra layer of comfort inside their sleeping bag. Considering how we all crave for a cozy sleep after a hard day on the trails, this is a definite win.
Let's not forget its thermal performance. While not meant to replace a full sleeping bag in colder conditions, this liner can add a bit of warmth, with its ability to increase your sleeping bag's temperature rating. Some users have found it can add up to 5 degrees (F) of warmth, although experiences vary.
However, it wouldn't be fair to overlook a few concerns that some users have expressed. A handful of users have found it a bit cramped, especially for those who prefer a bit more legroom when sleeping. Additionally, the lack of a side opening or a zip can make it hard to get in and out of, which could be a trade-off for its ultralight design.
Finally, it packs down small into a fitted stuff sack, which can be a real space saver in your backpack. It does take a bit of practice to get it back into the sack, but most users didn't seem to find this to be a big issue.
To sum up, the Sea to Summit Spark Ultralight Sleeping Bag Liner packs in a good set of features, but not without some limitations. Its ultralight design seems to be a hit for the weight-conscious outdoor enthusiasts but introduces some trade-offs in terms of space and accessibility.
Durability
Fear not, the Sea to Summit Spark Ultralight Sleeping Bag Liner has been designed to last. Its Ripstop construction mean it won't easily tear or fray, even with repeated use.
Material & Comfort
This liner is made from Ripstop 15D Nylon, a lightweight yet robust material. It's also super breathable, ensuring a comfortable night's sleep no matter your location. Its soft texture adds an extra layer of comfort to any sleeping bag.
Size & Fit Variety
While generally spacious, a few customers have remarked that it may not fit larger sleeping bags as well as one would hope. It's always advised to double check the liner's dimensions against your own bag.
Value
The Spark Ultralight liner sits at the pricier end of the sleeping bag liner market. However, the quality of the material, the warmth it provides, and its compact design largely justifies the price. In short, it's a strong investment for regular campers and hikers.
Warmth & Insulation Enhancement
Undoubtedly, the Sea to Summit Spark Ultralight Sleeping Bag Liner stands out in terms of providing that extra bit of warmth. The liner can add up to 5 degrees F to your sleeping bag, making it a great addition for those chilly nights spent under the stars.
Weight
One thing that stands out about this liner is its ultra lightweight design. It's super light and won't weigh down your hiking backpack, hence the 'Ultralight' in the name.
Prices
No prices found. Check back later!
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