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
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Western Mountaineering Ultralite -7
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Kelty Cosmic Ultra 20F
Sleeping Bag Reviews UK
Western Mountaineering Ultralite -7
Price At Time Of Writing | £625.00
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
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
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
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
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
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
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
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
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
Price At Time Of Writing | £510.00
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
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
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.