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Sleeping bag liners for hiking and camping

A sleeping bag liner slips inside your sleeping bag to protect it from sweat and add a little warmth. You can also use it on its own on warm nights or in a mountain hut. At Freezedried & Co, we select lightweight, compact liners from Cocoon and Sea to Summit in silk, organic cotton, microfibre and merino wool, in mummy-shaped and rectangular designs. Weighing no more than a few hundred grams, this small accessory makes nights more comfortable and helps your sleeping bag last longer.

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What is a sleeping bag liner?

A sleeping bag liner is a sheet sewn into a bag shape that fits inside your sleeping bag. It sits between your body and the bag’s insulation. It can also be called a sleeping bag sheet or simply a liner. Used on its own, it makes lightweight bedding for summer nights, mountain huts or hostels.

Why use a sleeping bag liner?

Hygiene: it absorbs sweat and dirt. It’s easy to wash and can be cleaned much more often than a sleeping bag.
A longer-lasting sleeping bag: washing your sleeping bag less often helps it retain its loft and insulating performance for longer.
Extra warmth: it adds a layer of insulation, with the amount of warmth depending on the material.
Comfort: silk and cotton feel nicer against your skin than the technical fabric of a sleeping bag.
In mountain huts: many require you to bring your own sleeping bag liner, while providing blankets.

Which material should you choose for your sleeping bag liner?

Silk: the lightest and most compact option. Very soft and ideal for trekking and ultralight trips, though it adds little warmth.
Cotton and organic cotton: durable, comfortable and easy to wash, but heavier and slower to dry. Ideal for mountain huts and travel.
Microfibre and synthetics: a good balance of weight, price and easy care; quick-drying too.
Merino wool: warm, temperature-regulating and naturally odour-resistant. A good choice for several nights without access to laundry facilities.
Vapour barrier (or VBL): a specialist option for extreme cold that stops moisture from your body reaching the sleeping bag’s insulation.

Mummy-shaped or rectangular?

A mummy-shaped sleeping bag liner follows the shape of a mummy sleeping bag. It’s lighter and more compact, without excess fabric bunching up at the bottom of the bag. A rectangular liner gives you more room to move, fits rectangular sleeping bags and works well on its own in a mountain hut or in summer. Choose a liner shape that matches your sleeping bag.

How much extra warmth does a sleeping bag liner provide?

The extra warmth depends mainly on the material. Silk and cotton provide a modest boost; wool and thermal fabrics offer more. Manufacturers quote different figures based on their own testing methods, so treat them as a rough guide. A liner can extend your sleeping bag’s usable temperature range slightly, but it cannot replace a sleeping bag suited to the night’s temperature or a good sleeping mat to insulate you from the ground.

How do you care for a sleeping bag liner?

Follow the care label. Cotton and microfibre can generally be machine-washed. Silk and merino wool need a delicate cycle or hand-washing at a low temperature with a suitable detergent. Dry flat, out of direct sunlight. Wash your liner regularly to keep your sleeping bag clean for much longer.

Complete your sleep system

A sleeping bag liner is one part of your sleep system: pair it with a sleeping bag chosen for its comfort temperature, an insulated sleeping mat and a lightweight camping tent. Keep everything dry in your rucksack with a dry bag. Explore our full sleeping gear range and all our camping equipment.

Our sleeping bag liner brands

Cocoon, a specialist in travel sheets, offers sleeping bag liners in silk, organic cotton, microfibre and merino wool, plus a vapour barrier model. Sea to Summit rounds out the range with lightweight, compact silk liners designed for hiking.

Sleeping bag liner FAQs

What is a sleeping bag liner for?

It protects your sleeping bag from sweat, adds a little extra warmth and makes sleeping more comfortable. On its own, it serves as a lightweight sheet in summer, in a mountain hut or in a hostel.

Silk or cotton sleeping bag liner?

Silk is lighter, more compact and softer: it’s the choice for hikers counting every gram. Cotton is more durable and affordable, but heavier, making it well suited to travel and stays in mountain huts.

Do you need a sleeping bag liner in a mountain hut?

Many mountain huts require you to bring your own sleeping bag liner for hygiene reasons. Check with the hut before your stay.

How do you wash a silk sleeping bag liner?

Wash it by hand or on a delicate machine cycle at a low temperature, using a detergent for silk or delicate fabrics. Avoid a vigorous spin cycle and dry it flat, out of the sun.

Can you sleep in a sleeping bag liner without a sleeping bag?

Yes, on warm nights or in mountain huts and hostels where blankets are provided. When temperatures drop outdoors, it cannot replace a sleeping bag.

A team here to help

Not sure whether to choose silk or merino, mummy-shaped or rectangular? Contact us or visit our shop in Lorient. We’ll help you put together a comfortable sleep system for your nights outdoors.