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A sleeping bag liner is a great investment for every camping enthusiast. Depending on the material you choose, it can extend the seasonality of your summer sleeping bag by adding another layer of insulation; or it can serve as an alternative option when the weather gets too hot for your winter sleeping bag. A liner also keeps the inside of your sleeping bag clean without having to wash it after every trip, thereby increasing its lifespan.
But when it comes to buying one, there are a few key things to take into consideration, including price, material (polyester, microfiber fleece, moisture-wicking fabric, etc.), size (you'll probably want something that's easily packable) and its ability to keep you warm or cool depending on your sleeping preferences and where you're looking to set up camp. To make your search a little easier, we rounded up the best sleeping bag liners to buy online, from luxurious silk options to ones impregnated with insect repellent.
Our Top Picks
Best Overall: Therm-A-Rest Sleeping Bag Liner
Those in search of a reliable, high-quality sleeping bag liner suited to camping in moderate climates should consider this option from leading brand Therm-A-Rest. Made of brushed polyester, the liner feels ultra-soft, guaranteeing cozy comfort. It’s also machine washable, a major plus if your main reason for buying a liner is to keep your sleeping bag clean. The hooded mummy style is designed to retain body heat while keeping the total weight to a minimum.
Sewn-in loops allow you to secure the liner to the inside of all Therm-A-Rest sleeping bags, quilts and tech blankets, so that you don’t end up with it tangled around your legs in the middle of the night. The three-quarter zip allows for easy entry and exit. Use the liner on its own in warm weather or add it to your sleeping bag to provide an extra 5ºF/3ºC of warmth in winter. There are three sizes, the largest of which measures 9 x 5 inches when packed and weighs just 11 ounces. Your purchase includes a stuff sack and a limited lifetime warranty.
Best Budget: The Friendly Swede Travel and Camping Sheet Sleeping Bag Liner
Available in cobalt or silver, The Friendly Swede Travel and Camping Sleeping Bag Liner retails at half the price of some of the other options on this list. Made from machine-washable polyester, the liner has a 23-inch side opening with a velcro closure. It can also act as a comfortable hygienic shield for use in hostels and hotels, with a roomy envelope shape for maximum leg room and an integrated pillow pocket. It folds down into a 6 x 8 inches bag and weighs just 8.35 ounces, making it the ideal companion for overseas travels. What's more, the product is backed by a lifetime warranty.
Best Microfiber: Osage River Microfiber Zippered Sleeping Bag Liner
The Osage River Microfiber Zippered Sleeping Bag Liner is made from lightweight microfiber fleece. It’s warmer than cotton and more affordable than silk and is a great option for those that need a little extra insulation for camping in winter or at altitude. The sleeping bag liner is rated to 55ºF/12ºC on its own, but you can use it in conjunction with a sleeping bag to stay comfortable at much lower temperatures. It’s also especially popular for its softness.
Designed to fit inside an adult sleeping bag, its envelope shape creates plenty of space for your feet. The liner can be fully unzipped, turning it into a blanket for use around the campfire or inside your home. The only drawback is the liner’s bulk, which makes it unsuitable for expedition trips when packing light is a necessity. Coordinate your camping gear by choosing your liner in gray, navy or red. All purchases come with a handy storage bag.
Best Fleece: Coleman Stratus Adult Fleece Sleeping Bag Liner
An Amazon’s Choice product, the Coleman Stratus Adult Fleece Sleeping Bag Liner may be bulkier than microfiber fleece liners, but it’s an excellent choice when staying warm is a priority. When used on its own as a low-profile sleeping bag, it will keep you toasty in temperatures as low as 50ºF/10ºC. It also adds up to 12ºF/ 7ºC of thermal protection to most full-sized sleeping bags.
A patented two-way ZipPlow system keeps the fleece away from the zip, so you don’t have to worry about snags when packing up in a hurry. Use the elastic storage strap and included stuff sack to compress the bulk as much as possible, then throw the liner in the washing machine when you get home. At 33 x 75 inches, it’s suitable for most people up to 5-foot, 11 inches in height and comes with a five-year warranty.
Best Silk: Cocoon Silk Mummy Liner
Silk sleeping bag liners are pricier than other options, but they’re also incredibly lightweight, pack away to almost nothing and feel incredible against the skin. The Cocoon Silk Mummy Liner receives rave reviews for its ability to deliver hotel-quality comfort in the middle of the woods. It dries quickly, stays cool in summer and adds an impressive amount of warmth in winter.
This mummy-shaped sleeping bag liner is crafted from ripstop silk, which uses a grid-like weave to resist tears and increase longevity. It can be washed by hand or in the machine and comes in a range of colors and patterns including olive, sunset and African night. The liner is zip-free, meaning that you have to slide into it. However, this is a pro for some as it helps keep weight to an absolute minimum.
Best for Warm Climates: Sea to Summit Adaptor CoolMax Sleeping Bag Liner
Made from stretchy, lightweight CoolMax fabric, this sleeping bag liner from Sea to Summit is designed to wick moisture, allowing you a more comfortable night’s sleep in hot and humid conditions. It’s machine washable, quick drying and exceptionally versatile. When the weather gets cooler, you can use it as an extra layer inside your sleeping bag to provide added warmth.
The mummy shape is a good fit for technical sleeping bags, while the box foot helps to prevent feelings of claustrophobia by providing enough space for your feet to point upwards. In low light, use the contrasting color strip along the liner’s top edge to find the opening easily. It comes with its own stuff sack, packs away to 3 x 5 inches, weighs 9.5 ounces and is protected by a lifetime warranty.
Best for Cold Climates: Sea to Summit Reactor Extreme Thermolite Liner
Convert your summer sleeping bag into one suitable for winter camping expeditions with the addition of the Sea to Summit Reactor Extreme Thermolite Liner. The bright orange Thermolite fabric has incredible insulating properties and can increase your sleeping bag’s performance by up to 27ºF/15ºC. The tapered mummy shape also helps to trap body heat while reducing the liner’s weight.
In especially cold weather, pull the drawcord hood tight for extra warmth. Even with the hood cinched closed, the liner’s box foot and super stretchy material stop even the most restless sleeper from feeling confined. It comes with its own stuff sack, which is made of water-resistant Ultra-Sil material so that the liner won’t get wet if you get caught in a downpour on your way to camp.
Best Insect Repellent: Sea to Summit Adaptor Sleeping Bag Liner
This version of the brand’s Adaptor CoolMax liner is specially designed for use in areas with plenty of bugs. It’s impregnated with Insect Shield technology, which effectively works even when using the liner by itself in hot climates. The comfortable, stretchy CoolMax fabric adapts quickly to different temperatures, keeping you warm on chilly nights and wicking moisture to keep you dry in high humidity. For extra protection from hungry bugs, draw the liner’s hood tight around your face. It comes in an Ultra-Sil stuff sack and is machine washable (though avoiding fabric softener is advisable in order to maintain the bag’s wicking properties).