Fjern Slumra Liner review: a back-to-basics sleeping bag liner that’s basically sound

The no-nonsense, polyester Fjern Slumra Liner will protect your sleeping bag when you’re on the go

Fjern Slumra Liner
(Image: © Fjern)

Advnture Verdict

A simple sleeping liner that offers decent protection for your favorite sleeping bag and adds cosiness on cooler nights.


  • +

    Recycled materials

  • +

    Small pack size

  • +

    Easy to wash


  • -

    Not very breathable

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Fjern Slumra Liner: first impressions

Fjern Slumra Liner

There’s some lovely contrasting color on the lining (Image credit: Fjern)

The no-frills Fjern Slumra Liner is a good choice for cooler camping conditions in spring and fall, or for using as an extra layer indoors in hostels or mountain huts in winter, when the polyester material traps in warmth nicely. 

Most of the sleeping bag liners we’ve come across aren’t recycled, but this one is made with 100 per cent recycled polyester, so it’s a more sustainable choice than most on the market.


• RRP: $38 (US) / £30 (UK)
• Weight: 340g / 12oz
• Pack size: 18cm x 8cm / 7in x 3in
• Material: Recycled polyester
• Shape: Mummy
• Color: Navy / Burnt Orange
• Compatibility: Pack this polyester liner for shoulder-season camping or for hosteling

Fjern Slumra Liner: in the field

Fjern Slumra Liner

Unfurling the Fjern Slumra Liner (Image credit: Fjern)

While providing warmth when required in chilly conditions, the polyester this liner is made from isn’t breathable enough to be comfortable in warm or humid weather, so you might need to switch to cotton or silk in such conditions. That said, on cooler nights this liner is surprisingly soft and comfortable against the skin, unlike some slippy or scratchy sleeping liners. 

This liner also does a great job of protecting your best sleeping bag from dirt and sweat, and once you’re back home, it comes out of the washing machine good as new, dries fast and feels like it could take years of camping – and washing – in its stride. 

At 340g and with a dinky pack size once it’s rolled up into its included stuff sack, the Slumra is a good portable option for backpacking trips, hut-to-hut hiking and camping trips where you’re packing light. Often available at a reduced price, this is an affordable option we’d recommend to more casual campers.

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.