Best Sleeping Bag | UK 2025

Tested in the highlands, valleys and cold-weather camps throughout the UK.

Find the best sleeping bag in the UK through our selection of thoroughly reviewed products. All sleeping bags here can be used for hiking or comfort camping and have a stated temperature rating suitable for conditions in the UK. To get to our results, we looked at almost one hundred different products and selected the best sleeping bags in each key category. We have assessed and provided comprehensive reviews of our top contenders for you to better decide on what sleeping bag to buy. Access them via the ‘Read Full Review’ buttons below. Need somewhere to sleep? Check out our list of best backpacking tents.

Updated 24th September 2025

Our Top Picks

  • Western Mountaineering Ultralite -7

  • Kelty Cosmic Ultra 20F

Sleeping Bag Reviews UK

Western Mountaineering Ultralite -7

Price At Time Of Writing | £625.00

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Overall Rating | 94

Comfort | 9

Construction | 9

Features | 8

Size/Weight | 10

Versatility | 8


Packed Size - 33x18cm

Weight - 820g

Fill - 850+ Goose Down


Best For - Alpinists needing a premium warmth-to-weight ratio

Pros - Light, retains heat, packs quite small

Cons - Snug, poor ventilation

Overall - A fantastic warm bag that’s still light

Sea to Summit Spark Pro -9

Price At Time Of Writing | £509.99

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Overall Rating | 92

Comfort | 9

Construction | 9

Features | 8

Size/Weight | 9

Versatility | 7


Packed Size - N/A

Weight - 791g

Fill - 950-fill Ultra-Dry Down


Best For - Ultralight thru-hikers wanting top features and minimal weight

Pros - Warm, lightweight, feature-rich

Cons - Costly, fabric a bit fragile

Overall - A high-end bag for the gram-counting adventurer

Valandre Bloody Mary

Price At Time Of Writing | £373.90

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Overall Rating | 91

Comfort | 8

Construction | 9

Features | 8

Size/Weight | 8

Versatility | 9


Packed Size - 18.5x21.5cm

Weight - 1.18kg

Fill - 800 French Fat Grey Goose Down


Best For - Expedition mountaineers needing something waterproof and durable

Pros - Compact, warm, waterproof, breathable

Cons - Cost, mummy shape, not the most comfortable

Overall - A bag built for extreme conditions

Rab Mythic Ultra 120

Price At Time Of Writing | £349.99

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Overall Rating | 90

Comfort | 8

Construction | 9

Features | 8

Size/Weight | 10

Versatility | 5


Packed Size - 32x16cm

Weight - 330g

Fill - 900-Fill Power European Goose Down


Best For - The hiker who demands something lightweight

Pros - Warm, ultralight

Cons - Snug, half-length zipper, not the most versatile

Overall - The sleeping bag for weight-conscious backpackers

The North Face Blue Kazoo

Price At Time Of Writing | £346.82

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Overall Rating | 90

Comfort | 8

Construction | 8

Features | 7

Size/Weight | 10

Versatility | 7


Packed Size - 43x23cm

Weight - 1.1kg

Fill - 700g ProDown


Best For - Three-season backpackers who are comfortable with a narrow footbox

Pros - Even warmth distribution for its weight

Cons - Narrow footbox

Overall - A reliable and well-designed three-season bag

Mountain Hardwear Phantom

Price At Time Of Writing | £650.00

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Overall Rating | 90

Comfort | 9

Construction | 8

Features | 8

Size/Weight | 8

Versatility | 7


Packed Size - 21x42cm

Weight - 1.22kg

Fill - 850-fill Goose down


Best For - General backpacking in drier conditions

Pros - Warm, compresses well for warmth, value

Cons - Down isn’t hydrophobic

Overall - An all-round bag that’s warmth and not too heavy

Therm-a-rest Hyperion 20

Price At Time Of Writing | £335.75

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Overall Rating | 89

Comfort | 6

Construction | 9

Features | 9

Size/Weight | 10

Versatility | 5


Packed Size - 15.24x20.32cm

Weight - 624g

Fill - Nikwax goose down


Best For - Ultralight summer backpackers prioritising minimal weight above all else

Pros - Extremely lightweight, high-quality materials

Cons - Snug fit, less warm than some rivals

Overall - A high-end lightweight bag for conditions where every gram matters

Big Agnes Torchlight 20

Price At Time Of Writing | £299.99

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Overall Rating | 89

Comfort | 8

Construction | 8

Features | 7

Size/Weight | 8

Versatility | 8


Packed Size - 44x20cm

Weight - 1.02kg

Fill - 850-Downtek Water-Repellent Down


Best For - Restless sleepers who need freedom of movement during three-season trips

Pros - Roomy, comfortable rectangular shape, water-resistant down

Cons - Heavier than true ultralight bags, zipper can snag, value for money

Overall - An excellent bag for those who move around in their sleep and value space

Kelty Cosmic Ultra 20F

Price At Time Of Writing | £199.99

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Overall Rating | 88

Comfort | 8

Construction | 7

Features | 7

Size/Weight | 7

Versatility | 9


Packed Size - ‎35.56x19.05cm

Weight - ‎1.09kg

Fill - 800-fill DriDown


Best For - Budget-conscious backpackers looking for a reliable, versatile three-season bag.

Pros - Great value, reliable warmth, good water-resistance, comfortable

Cons Packs larger than other bags

Overall A versatile and dependable all-rounder for the weight-conscious adventurer

Rab Neutrino 800 sleeping bag

Rab Neutrino 800

Price At Time Of Writing | £510.00

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Overall Rating | 84

Comfort | 7

Construction | 7

Features | 6

Size/Weight | 8

Versatility | 6


Packed Size - 24x33cm

Weight - 1.29kg

Fill - 800-fill Goose down


Best For - Winter and alpine hikers needing a compact, warm bag for cold conditions

Pros - Excellent warmth-to-weight ratio, compresses very small

Cons - High cost

Overall - A high-performance bag that delivers reliable warmth for its minimal bulk

Sea to Summit Trek Down -9

Price At Time Of Writing | £339.90

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Overall Rating | 83

Comfort | 7

Construction | 8

Features | 6

Size/Weight | 7

Versatility | 5


Packed Size - N/A

Weight - 1.44kg

Fill - 650-Fill Duck Down


Best For - Car camping and short backpacking trips where comfort is the top priority

Pros - Very spacious and comfortable, adaptable design

Cons - Relatively heavy and bulky for backpacking

Overall - A comfortable and versatile bag best suited where pack size isn't a primary concern

Big Agnes Sidewinder SL 20

Price At Time Of Writing | £300.05

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Overall Rating | 80

Comfort | 7

Construction | 7

Features | 6

Size/Weight | 4

Versatility | 6


Packed Size - 20x44cm

Weight - 1.02kg

Fill - 650 DownTek™ and FireLine™ Eco


Best For - Side sleepers who need room to bend their knees without compressing the insulation

Pros - Unique asymmetric shape is good for side sleepers, warm

Cons - Not suited for back sleepers, some down leakage

Overall - A specialised bag that solves comfort issues for active sleepers in the cold

Overall Results

Afterword

Sleeping bags are a basic essential when going on outdoor adventures. Whether you are hiking or camping, the selection on this page will guide you through choosing the best sleeping bag in the UK. Have a new product you’d like us to review? Hit up our contact page and send us specific product suggestions. We’d love to hear from you!

About Our Testing Process

Here at The Equipment Guide, we write reviews for the UK with the goal of providing a genuine personal assessment of the best products.

All products are reviewed and ranked in a methodical and careful manner and we assess them on relevant key features. We do not accept free products from manufacturers.

Our mission is simple: To create the UK’s best outdoor gear reviews.

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