Nemo
Nemo Riff -1 °C Endless Promise (men's, Regular)
Where it fits
- Also works for
- Bikepacking, Backpacking and wild camping
- Not for
- Winter mountain
Why these labels
- Bikepacking: Small enough for bike bags: packs to 4 litres
- Backpacking and wild camping: Light to carry: 0.8 kg
- Winter mountain: Comfort rating 4 °C: too cold for winter nights
From the maker's stated use and the published specs.
- Summer wild camp: 8/10 UK, roughly May to September, nights above about 8 °C, sheltered pitches.
- Three-season hills: 4/10 UK hills in spring and autumn. Wind, rain, and nights near freezing. Capped at 4: needs warmth 7+ (comfort 0 °C or colder).
- 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: 8/10 How much it adds to your pack, compared with the whole market.
Comfort 4 °C, limit -2 °C (ISO 23537).
Side sleepers and restless sleepers on spring-to-early-autumn UK camps, with nights above about 4 °C
- Zip
- Half, left side
- Comfort
- 4 °C
- Limit
- -2 °C
- Fill
- 800 fill down
- Weight
- 845 g (Regular)
Packed size 4 L, 26 cm long and 19 cm across Compare with a 2-litre bottle
About as long as a 2-litre bottle and about twice as wide. Drawn to scale.
Where to buy
Alpinetrek £269.96 In stock. Free delivery.
View at shop: AlpinetrekUltralight Outdoor Gear £309.99 In stock. Free delivery.
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 5/10How cold a night you can sleep comfortably through. 5: Does the job. Average for wild-camping gear.
ISO comfort 4 °C (limit -2 °C) sits in the 0.1 to 5 °C band. A three-season bag for spring to early autumn; the -1 °C in the name is the rounded limit rating. The maker's figure, not re-tested.
Room inside
Estimate: only 1 review about room inside (fewer than the 3 we need, so never above 8) 8/10How much room to move, bend your knees and sleep on your side. Roomier is comfier. 8: Clearly better than most.
OutdoorGearLab calls the Riff notably roomy and one of the best for side sleepers, with extra girth below the waist. Only two independent sources were found.
Weight
From maker's figures 8/10How much it adds to your pack. 8: Clearly better than most.
845 g (the maker's minimum weight, Regular) sits in the 700-999 g band. The UK shop lists 857 g and The Big Outside's reviewer weighed 879 g on his scale; both are in the same band.
Packed size
From maker's figures 8/10How much room it takes in your rucksack. 8: Clearly better than most.
Maker states a 4 L compressed volume, so we use that (4-5.9 L band). Its own 26 x 19 cm packed size works out larger: 3.1416 x 9.5 x 9.5 x 26 = about 7.4 L, which would be the 6-8.9 L band. The Big Outside notes it is not among the most compact down bags at this rating.
In short
Good for
- Side sleepers and restless sleepers on spring-to-early-autumn UK camps, with nights above about 4 °C
- Campers who want a roomy bag without much weight: 845 g in Regular
Strengths
- Roomy spoon shape with extra space at the elbows and knees, at 845 g
- Chest vents with interior and exterior zips let you shed heat without a cold draught, and the large collar folds in or out
- Hydrophobic 800 fill down, with a reinforced waterproof hood and footbox against tent condensation
- Recycled shell and lining; Nemo takes the bag back for recycling at the end of its life
Weaknesses
- ISO comfort is only 4 °C, so cold sleepers need a warmer bag or layers for UK spring and autumn nights near freezing
- The roomy cut leaves more air to warm up, and The Big Outside says it is not among the most compact down bags at this rating
- The maker's packed volume (4 L) does not match its own packed size (26 x 19 cm, about 7.4 L), so check it fits your rucksack
- Short on independent evidence: we found only one test of the current version, so damp performance, comfort and durability are estimates, not reviewed scores
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.
ShowHide sources (4)
- NEMO Equipment: Riff Men's Endless Promise Down Sleeping Bag, Regular specifications (US site: limit, weight, compressed volume, packed size)
- Ultralight Outdoor Gear: Nemo Riff Down Sleeping Bag, Regular (UK shop page: ISO comfort and limit, weight, fill power)
- The Big Outside: Review of the Nemo Riff Endless Promise sleeping bag (men's Regular, 2024 update, 8 nights)
- OutdoorGearLab: Nemo Riff 30 review