6 Best Sleeping Bag Liners for Backpacking in 2021 - Greenbelly Meals

Sleeping Bag Liners

A guide to the best ultralight sleeping bag liners for backpacking and hiking.

best sleeping bag liners for hiking and backpacking


At a Glance:

‣ Sleeping bag liners protect the inside of sleeping bags from dirt and oils.

‣ Liners have many benefits: they provide additional warmth, can be used alone in warmer climates, and prevent you from having to wash your sleeping bag too often.

‣ Consider weight, shape, and fabric (cotton, silk, polyester blends, etc.) when choosing.

‣ Best models by Sea to Summit, Cocoon, Western Mountaineering, and more.

What is a sleeping bag liner?

A sleeping bag liner does exactly what it sounds like - it lines your sleeping bag. The liner is usually made of a thin cloth and is shaped like a cocoon. It is designed to be worn as a barrier between you and the actual sleeping bag itself. You can sleep in the liner wearing clothes or butt naked. Think of a sleeping bag liner as a bed sheet for the backcountry.

best sleeping bag liner for backpacking and hiking


Why are sleeping bag liners useful?

Additional Warmth. Depending on the thickness, a sleeping liner can help insulate a lot of extra precious heat inside your sleeping bag. Example: a sleeping bag rated at 30 degrees, with the addition of a 10 degree liner, could then be rated at 20 degrees.

Seasonal Flexibility. A sleeping bag liner is not only great extra warmth in cold weather, but it's also great for warm weather. Instead of packing your heavy and bulky sleeping bag around with you that will be a sweaty oven, you might be able to only pack your liner. They are very lightweight and most can pack down enough to fit inside a Nalgene bottle. 

Washable. It is a huge pain to wash a sleeping bag. It can be especially painful washing a down sleeping bag. The dry cleaners are super expensive and time consuming. Some cleaners may not know how to treat a down bag and can destroy it's loft and insulation ability. On the contrary, sleeping bag liners are easily washable at home and can save you a trip to the cleaners.

Sleeping Bag Protection. On the cleanliness note, by wearing a liner at night, you will inevitably minimize the amount of dirt, oil and filthy hiker grime that reaches your sleeping bag. Protecting a $500 bag with a $50 liner makes a lot of sense.

Super Comfortable. Most backpacking clothing is synthetic. Most sleeping bag material is synthetic. Most hikers long for the feel of bed sheets at the end of a long day. A soft liner to cuddle up inside is the next best thing.

best sleeping bag liner for backpacking and hiking

Things to Consider...

Not all sleeping bag liners are created equal. Here are some differentiating factors.

Materials: There are several types of liner materials: cotton, silk, fleece, merino wool and polyester 'blends' are the most common. Cotton is my personal favorite simply because of the way it feels on my skin. Slightly heavier though and worthless when wet. Silk is ultra lightweight and very comfortable, but less durable. Fleece is cheap and warm, but heavy and bulky. Merino wool is the best for weight, warmth and comfort, except for its hefty price tag. Blends range all over the map on materials.

Heat Rating: Most companies will provide some sort of temperature rating in the specs. This number is only the additional amount of warmth it can provide. The warmest backpacking liners are rated up to 15-25 degrees.

Weight: Obviously, a 25 degree thermal liner will weigh more than a 5 degree sheet. Consider how much of a priority the thermal properties are to you before getting a heavy liner. Even the thickest liners should not weigh more than a pound though.

Tapered or Rectangular: You can get liners that are rectangularly shaped (more spacious to sleep in) or tapered around the head and feet (lighter and more compact). Some also come with an adjustable drawstring around the head to "mummy" it around your face.

Bug Protection: If you like to cowboy camp (no tent) a lot, bugs crawling at night on and around you can be an issue. Some liners come with insect resistant coated fabrics to deter any the unwanted creepy crawlies.

Breathability: Sleeping bags can get steamy. You want your liner to help wick any moisture away from your body. Not crucial, but look for liners with the "CoolMax" trademarked feature if you tend to sweat.

The Best Sleeping Bag Liners

Weight Warmth
COCOON - COOLMAX 9.0 oz 5° F

best sleeping bag liners for ultralight backpacking and hiking


This is the sleeping bag liner I personally use. It is not the warmest. But, I'm a sucker for the way this cotton/polyester material feels. Insect Shield is built in as an invisible and odorless bug protectant.

Weight: 8.6 oz; Warmth: 5° F

See Sea to Summit Coolmax.

best sleeping bag liners for ultralight backpacking and hiking


Very comfortable material and similar to the Sea to Summit liner above... except the Cocoon Coolmax costs about $15 less. You sacrifice the Insect Shield though.

Weight: 9.0 oz; Warmth: 5° F

See Cocoon Coolmax.

best sleeping bag liners for ultralight backpacking and hiking


The definition of an ultralight liner. These weigh less than half of most sleeping bag liners. Sleek silk material packs down tiny and feels great on the skin. Costs about $20 more than most other liners.

Weight: 3.6 oz; Warmth: 5° F

See Western Mountaineering Tioga.

best sleeping bag liners for ultralight backpacking and hiking


Great warmth-to-weight ratio. This liner can stand as a light blanket on its own and is great for colder backpacking conditions. A little bulky. Also check out the Reactor PLUS model for even more warmth.

Weight: 8.1 oz; Warmth: 15° F

See Sea to Summit Reactor.

best sleeping bag liners for ultralight backpacking and hiking


A very popular silk bag liner. It is less expensive than the Western Mountaineering Tioga. It weighs over an ounce more though.

Weight: 4.7 oz; Warmth: 5° F

See Cocoon Silk Mummy.

best sleeping bag liners for ultralight backpacking and hiking


Only got $10 for a liner, huh? Cool. You can always make your own. You will need some needle and thread and a few hours to spare as well. Find a fleece blanket or bedsheet at Walmart. Follow instructions on how to shape and sew your own here.

chris cage greenbelly

By Chris Cage
Chris launched Greenbelly Meals in 2014 after thru-hiking the Appalachian Trail for 6 months. Since then, Greenbelly has been written up by everyone from Backpacker Magazine to Fast Company. He wrote How to Hike the Appalachian Trail and currently works from his laptop all over the globe. Instagram: @chrisrcage.

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