Mountain Warehouse sleeping bag liner review: a hot-weather specialist

Well-priced and soft-to-touch, the polycotton Mountain Warehouse sleeping bag liner works well for hot weather and tropical travels

Mountain Warehouse sleeping bag liner
(Image: © Mountain Warehouse)

Advnture Verdict

A light and breathable polycotton liner that feels great against the skin – ideal for hot summer nights under canvas.


  • +

    Pillow pocket

  • +

    Breathable material

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    Cool on hot nights


  • -

    Snug fit

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    Thin material

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Mountain Warehouse sleeping bag liner: first impressions

You can’t call the Mountain Warehouse sleeping bag liner a liner for all seasons, but for the season it specializes in, it’s a winner, which is why it nabs a place in our best sleeping bag liner buying guide.

Summer is a lovely time to camp outdoors – until you overheat in your stuffy three-season sleeping bag. On hot nights under canvas, swap to this lightweight and breathable liner. 

This simple but quite thin-feeling rectangular liner is a good choice for tropical travelling, bothying escapades, festivals and more casual summer camps.


• RRP: $25 (US) / £19.99 (UK)
• Weight: 360g / 12.7oz
• Pack size: 25cm x 10cm / 10in x 4in
• Material: Polycotton
• Shape: Rectangular
• Color: Pale Blue
• Compatibility: Ideal for hot summer camps and international travel

Mountain Warehouse sleeping bag liner: in the field

Polycotton is a mix of cotton and polyester (here, it’s 35% cotton, 65% polyester), which offers a good balance between the softness and moisture-wicking properties of cotton and the added durability of polyester. 

We found this cotton mix felt really nice against the skin, unlike some slippery polyester liners – if you miss the softness of your favorite duvet when you’re camping, this liner might help you get a comfier night’s sleep. 

It washes and dries easily when you’re back home from your adventures (although the pale blue color does show the dirt easily). A sewn-in pillow pocket is great for keeping a camping pillow in place all night if you tend to toss and turn in your sleeping bag. 

Mountain Warehouse’s design is quite snug to slide into, so taller or bigger campers may want to pick a liner with a more generous width. Shorter men, women and teenaged campers should find it fits them fine, but there isn’t loads of room to move about.

Sian Lewis

An award-winning travel and outdoors journalist, presenter and blogger, Sian regularly writes for The Independent, Evening Standard, BBC Countryfile, Coast, Outdoor Enthusiast and Sunday Times Travel. Life as a hiking, camping, wild-swimming adventure-writer has taken her around the world, exploring Bolivian jungles, kayaking in Greenland, diving with turtles in Australia, climbing mountains in Africa and, in Thailand, learning the hard way that peeing on a jellyfish sting doesn’t help. Her blog,, champions accessible adventures.