Marmot
Marmot Trestles Elite Eco Synthetic Sleeping Bag (-1 °C)
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 17.5 litres
- Winter mountain: Comfort rating 0 °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: 5/10 How much it adds to your pack, compared with the whole market.
Comfort 0 °C, limit -6 °C (ISO 23537).
Damp UK trips where synthetic fill is the safer choice if the bag gets wet
- Zip side
- Both
- Comfort
- 0 °C
- Limit
- -6 °C
- Fill
- synthetic
- Weight
- 1.18 kg (Regular)
Packed size 17.5 L, 46 cm long and 22 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 £134.26 In stock. Free delivery. Regular, left zip. Shop list price £169.95.
View at shop: AlpinetrekUltralight Outdoor Gear £144.99 In stock. Free delivery. Regular. Shop RRP £169.99.
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.
Marmot's ISO comfort 0 °C (limit -6 °C) sits in the -4.9 to 0 °C band, right at the warm edge: good for spring and autumn, not for hard frost.
Room inside
Estimate from maker's specs: bag shape (fewer than 3 reviews about room) 3/10How much room to move, bend your knees and sleep on your side. Roomier is comfier. 3: Below average. Fine for some trips, not others.
No review we found says how roomy it is, so this is an estimate from the bag shape.
Weight
From maker's figures 5/10How much it adds to your pack. 5: Does the job. Average for wild-camping gear.
1,180 g (Regular, Marmot's figure) sits in the 1,000–1,299 g band.
Packed size
From maker's figures 1/10How much room it takes in your rucksack. 1: A real weak point.
Marmot gives a pack size of 46 x 22 cm (length x width), so 3.1416 x 11 x 11 x 46 = 17,486 cm³, so 17.5 L, in the 13 L+ band; a compression sack comes in the box.
In short
Good for
- Damp UK trips where synthetic fill is the safer choice if the bag gets wet
Strengths
- Synthetic fill keeps its warmth when damp and the bag is easy to wash
- Full-length zip plus a short second zip gives good ventilation
- Internal stash pocket for a head torch or phone
- Recycled shell, lining and insulation in one material, so it can be recycled as a whole
Weaknesses
- Bulky at about 17.5 L, against 5–8 L for down bags of similar warmth
- 1,180 g is heavy for a bag with a 0 °C comfort rating
- Comfort rating sits right at 0 °C, so cold sleepers will need extra layers on frosty nights
- No independent reviews found, so three scores are 'Not enough evidence'
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.