Big Agnes
Big Agnes Greystone -7 °C Down Sleeping Bag (Regular)
Best use
- Made for
- Backpacking and wild camping
- Not for
- Bikepacking, Winter mountain
Why these labels
- Backpacking and wild camping: The maker states this use, and the published specs do not rule it out.
- Bikepacking: Bulky for bike bags: packs to 21.2 litres
- Winter mountain: Comfort rating -2 °C: too cold for winter nights
From the maker's stated use and the published specs.
- Summer wild camp: 4/10 UK, roughly May to September, nights above about 8 °C, sheltered pitches.
- Three-season hills: 5/10 UK hills in spring and autumn. Wind, rain, and nights near freezing.
- Winter camp: 4/10 UK winter or high ground. Below freezing, strong wind, possibly snow. Capped at 4: needs warmth 9+ (comfort -5 °C or colder).
- Weight: 6/10 How much it adds to your pack, compared with the whole market.
Comfort -2 °C, limit -8 °C (ISO 23537).
Three-season backpacking and wild camps from spring to autumn on a mid-range budget
- Zip side
- Left
- Comfort
- -2 °C
- Limit
- -8 °C
- Fill
- 650 fill down
- Weight
- 1.01 kg (Regular)
Packed size 21.2 L, 51 cm long and 23 cm across Compare with a 2-litre bottle
About one and a half 2-litre bottles long and about twice as wide. Drawn to scale.
Where to buy
Alpinetrek £232.46 In stock. Free delivery. Shop shows list price £309.95. Free UK delivery from £85.
View at shop: AlpinetrekUltralight Outdoor Gear £279.99 In stock. Free delivery. Shop shows RRP £309.99. Free UK delivery over £15.
View at shop: Ultralight Outdoor GearPrices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More
Our ratings (out of 10)
1 to 10, compared with the whole market. Each says what it's based on. How we score
Warmth
From maker's figures 7/10How cold a night you can sleep comfortably through. 7: Better than most.
The shop copy of Big Agnes's spec table gives ISO comfort -2 °C (limit -8 °C) for the Regular, in the -4.9 to 0 °C band. The maker's figure, not re-tested; Alpinetrek also gives comfort -2 °C and limit -9 °C. The bag is named for -7 °C, which is its limit, not a comfort figure.
Room inside
Estimate from maker's specs: maker's shoulder girth (fewer than 3 reviews about room) 4/10How much room to move, bend your knees and sleep on your side. Roomier is comfier. 4: A bit below average.
No review we found says how roomy it is, so this is an estimate from the maker's shoulder girth.
Weight
From maker's figures 6/10How much it adds to your pack. 6: A bit better than average.
Alpinetrek's copy of the Big Agnes spec table gives 1,010 g for the Regular, in the 1,000-1,299 g band, only just inside it. Ultralight Outdoor Gear lists 998 g, which would be the 700-999 g band (the 4 band), so this score is the cautious reading.
Packed size
From maker's figures 1/10How much room it takes in your rucksack. 1: A real weak point.
No litre figure is published. Alpinetrek and Ultralight Outdoor Gear both give the Regular's stuff sack as 51 x 23 cm, a cylinder: 3.1416 x 11.5 x 11.5 x 51 = 21,189 cm³, so 21.2 L, in the 13 L+ band.
In short
Good for
- Three-season backpacking and wild camps from spring to autumn on a mid-range budget
- Campers who want a down bag with water-repellent treated fill for a damp UK tent
- Side sleepers who find very narrow mummy bags tight
Strengths
- 1.01 kg with 539 g of 650-fill water-repellent DownTek down
- ISO comfort -2 °C and limit -8 °C, with the same recycled shell and lining fabrics as the cheaper Anthracite
- Relaxed mummy shape with a contoured hood, no-draft collar and no-draft zip
- Zip can be mated with the Women's bag to share a tent
Weaknesses
- No independent hands-on test or review found, so damp, comfort and durability are estimates, not reviewed scores
- 650-fill down is heavier and bulkier than the 800-fill used in lighter bags, and the supplied stuff sack is a big one of about 21 L
- The maker's -7 °C name is the limit rating: use the -2 °C comfort figure for planning
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.
ShowHide sources (3)
- Big Agnes: Greystone 20 traditional mummy sleeping bag (product page: fill and features; its size and weight table does not load as text)
- Ultralight Outdoor Gear: Big Agnes Greystone 20 down sleeping bag (maker's spec table with ISO comfort and limit)
- Alpinetrek: Big Agnes Greystone 20 down sleeping bag (spec table: weight, stuff sack size, comfort and limit)