The 8 Best Sleeping Bag Liners of 2021

Top picks to sleep in style and comfort in the outdoors

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The Rundown

Best Overall: Sea to Summit Adaptor CoolMax with Insect Shield at Amazon

"The Sea to Summit Adaptor offers a great deal of versatility for gram-counting backpackers to hygienic-conscious travelers."

Best Budget: Tough Outdoors Sleeping Bag Liner at Amazon

"This 100 percent polyester liner offers an affordable solution for many sleepers."

Best Silk: Sea to Summit Premium Silk Travel Liner at Amazon

"Silk sleeping bag liner fans will enjoy this liner for its luxurious, lightweight, and compact feel."

Best Tall: Alps Mountaineering Mummy Sleeping Bag Liner at Amazon

"At 86 inches long, this sleeping bag liner accommodates people up to 7-feet tall."

Best for Backpacking: Western Mountaineering Tioga Silk Sleeping Bag Liner at Amazon

"At only 3.6 ounces, this sleeping bag liner will please hikers trying to keep their packs light."

Best Fleece: Big Agnes Fleece Sleeping Bag Liner at Amazon

"The Big Agnes Fleece Sleeping Bag Liner delivers up to 10 degrees of warmth to your sleeping bag’s temperature rating in a cozy package."

Best for Extreme Cold: Sea to Summit Thermolite Reactor Fleece Liner at Amazon

"When the mercury drops, the Sea to Summit Thermolite Reactor Fleece Liner adds up to 32 degrees of warmth to your sleep environment."

Best for Warm Weather: Cocoon MummyLiner Coolmax at REI

"This 100 percent polyester CoolMax material in this liner creates a fast-drying and moisture-wicking sleeping bag liner."

Regardless if you’ve elevated camping to an art or are a confirmed non-camper, spending time in the outdoors can bring relaxation and fun. Camping doesn’t have to mean roughing it. Adding a sleeping bag liner—an insert that goes inside your sleeping bag—to your camping essentials can help lead to a comfortable night’s sleep and additional warmth when temperatures drop. Plus, it can be cleaned easier than your sleeping bag once you get home. We’ve tracked down the best sleeping bag liners of 2021, so read on for our top picks.

Best Overall: Sea to Summit Adaptor CoolMax with Insect Shield

The Sea to Summit Adaptor offers a great deal of versatility for backpackers who want a lightweight liner to travelers whose top priority is a hygienic sleep environment. The moisture-wicking fabric keeps sleepers from feeling clammy and can stand on its own in warm, humid temps. The stretchy material in the mummy shape offers plenty of comfort regardless of the environment. A drawcord can increase warmth on cold nights by tightening the hood around your head. And a 3D footbox gives extra room for the feet even with the mummy style. The option of the additional insect shield repels mosquitos, ticks, fleas, and flies. It packs down into a convenient stuff sack measuring 6 x 4.5 inches.

Size: 82 x 36 inches | Weight: 8.7 ounces | Stuff sack measurements: 6 x 4.5 inches

Best Budget: Tough Outdoors Sleeping Bag Liner

This 100 percent polyester liner offers an affordable solution for many sleepers. The synthetic fabric makes it a relatively lightweight option for backpackers, plus it comes with a convenient carry bag. The rectangular shape can be slipped inside a sleeping bag or double as a sleep sack in a bed during travel. A large pillow pocket offers a handy feature for all types of users. Measuring 87 inches long, the bag works for the tallest sleepers. Although budget-friendly, the bag still comes with a one-year warranty.

Size: 87 x 32 inches | Weight: 14 ounces | Stuff sack measurements: 8 x 2.5 inches

Best Silk: Sea to Summit Premium Silk Travel Liner

Silk sleeping bag liner fans enjoy this material for its luxurious, lightweight, and compact feel. Sea to Summit's Premium Silk Traveler Liner has each of those qualities in spades. It’s fashioned from AA grade, ripstop fabric and the design also incorporates comfort stretch panels. The upshot: This liner will move with you as you toss and turn in your sleep. It adds a few degrees of warmth and the reviewed design here features a rectangular shape and pillow pocket. This liner is available in a mummy shape, a rectangular shape, and a double-sleeping-bag shape.

Size: 88 x 36 inches | Weight: 6 ounces | Stuff sack measurements: 4 x 6 inches

Best Tall: Alps Mountaineering Mummy Sleeping Bag Liner

At 86 inches long, this sleeping bag liner accommodates people up to 7-feet tall. The mummy-bag shape slips easily inside sleeping bags of the same shape and the polyester material adds a few degrees of warmth to a sleeping bag’s rating. The brushed fabric feels comfortable on the skin and will pave the way to a comfortable night’s sleep. The liner also packs down into the included stuff sack.

Size: 86 x 32 inches | Weight: 11 ounces

Best for Backpacking: Western Mountaineering Tioga Silk Sleeping Bag Liner

For backpacking, weight and performance are top priorities. At a feathery 3.6 ounces, this sleeping bag liner will please the biggest gram-saving nerds. The silk material is lightweight, and it’s compact. Anecdotally, the Indian silk's tight weave also helps keep bugs out. However, the fabric is not treated with any insect repellant. It only adds a few degrees of warmth, so if you’re looking for a warmer liner, you’ll need to continue the search. Reviewers report that the mummy shape of this liner can feel a bit narrow around the feet. But these are small prices to concede if ultralight backpacking is your style.

Size: 72 inches long | Weight: 3.6 ounces

Best Fleece: Big Agnes Fleece Sleeping Bag Liner

The Big Agnes Fleece Sleeping Bag Liner delivers up to 10 degrees of warmth to your sleeping bag’s temperature rating in a cozy package. It’s made with eco-conscious Polartec recycled microfleece material. The clever, reversible design allows it to slide into right or left-handed zipper sleeping bags. It’s finished with a generous 42-inch opening and a drawstring hood that can be pulled tight to keep the cold out when temperatures drop.

Size: 82 x 60 inches | Weight: 20 ounces | Stuff sack measurements: 10 x 7 x 6.5 inches

Best for Extreme Cold: Sea to Summit Thermolite Reactor Fleece Liner

When the mercury drops, the Sea to Summit Thermolite Reactor Fleece Liner adds up to 32 degrees of warmth to your bag. With that much insulating power, this is truly only a solution for extreme cold, unless you’re using this as a stand-alone product without a sleeping bag.

The Thermolite fibers use the same hollow structure as the fur of a polar bear, so the material traps a lot of insulating air. While heavier than others on this list, it's still a remarkable 14.8 ounces and packs down relatively small into the included stuff sack. A drawstring at the top pulls taught around your body just like your mummy bag to fend off the cold.

 Size: 79 x 28 inches | Weight: 14.8 ounces | Stuff sack measurements: 9 x 5 inches

Best for Warm Weather: Cocoon Coolmax Mummy Liner

The 100-percent polyester CoolMax material in the Cocoon Mummy Liner creates a fast-drying and moisture-wicking sleeping bag liner. The liner also features a four-channel design that siphons sweat away from the body. Overall, it’s a breathable liner that can also be used on its own in particularly humid environments.

 Size: 87 x 32 inches | Weight: 9 ounces | Stuff sack measurements: 3.5 x 7 inches

Final Verdict

We love the Sea to Summit Adaptor CoolMax with Insect Shield (view at Amazon) for the variety of ways it can be used. The moisture-wicking fabric is generally soft, comfortable, and breathable. The added insect shield, which repels mosquitos, ticks, and fleas, makes this liner an all-around crowd-pleaser.

What to Look For in a Sleeping Bag Liner

Heat Rating

Just as sleeping bags come with heat ratings, so do sleeping bag liners. This is the amount of additional warmth it will offer above and beyond your sleeping bag's warmth rating. Even thin cotton liners add a bit of warmth (around 5 degrees); however, the heftiest, insulated liners can add up to 25 degrees (or more) to your sleeping bag’s rating.

 Shape

Liners generally come in two shapes: mummy and rectangular. Mummy liners are broad at the shoulders and taper towards the feet and fit inside a mummy-style sleeping bag. Rectangular liners can be used on top of your bag in warmer temps or inside a rectangular bag. Generally, mummy liners (and bags) are lighter because of their smaller size and fewer materials.

 Breathability

Most sleeping bags are not known for extreme breathability. Sleeping bag liners, however, can offer breathability and moisture-wicking functionalities. The two don't necessarily have to be mutually exclusive, but oftentimes, they are. If you're camping more in colder climates, go for one of the heftier liners. If warm weather or summer camping is more your thing, look for fabrics that include synthetics like CoolMax, which adds to the liner’s breathability.

Weight

Thermal liners will, of course, weigh more than slimmer cotton or silk liners. Consider whether and how far you will be carrying the liner before opting for the heaviest liner. Most liners are around 8 ounces, but you can find them down to as light as 3 ounces or up to a pound.

 FAQs

Why should you use a sleeping bag liner?

Sleeping bag liners help keep you warm. If you know you'll be camping in very cold temps, having a liner in your gear arsenal is probably a good idea. Additionally, they can help keep difficult-to-clean sleeping bags clean. They play the same role your sheets do on your bed at home.

 What are sleeping bag liners made of?

Sleeping bag liners are made from a variety of materials. You should select your liner’s material based on what you plan to use it for. Cotton is both comfortable and budget-friendly; however, it’s also heavier. Many backpackers prefer silk because it’s lighter and more compact. When it comes to warmth, opt for fleece or microfleece. However, you’ll get some extra weight and bulkiness when you make this trade. Synthetic liners offer moisture-wicking and breathability that’s primed for humid climates. They also offer some stretch, so restless sleepers might opt for this material. For truly cold climates, campers can purchase insulated liners, which can add up to 25 degrees of additional warmth.

 Can sleeping bag liners stop bed bugs?

Anecdotally, campers say that silk sleeping bag liners can minimize contact with bed bugs and other insects. If you’re traveling to an area known for them, consider that material when selecting a liner.

Why Trust TripSavvy?

Freelance travel journalist Ashley M. Biggers has backpacked and camped all over her home state of New Mexico and in far flung locales, like the Australian outback.

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