Mountain Equipment
Mountain Equipment TransAlp down sleeping bag
Best use
- Made for
- Backpacking and wild camping
- Also works for
- Bikepacking
- Not for
- Winter mountain
Why these labels
- Backpacking and wild camping: The maker states this use, and the published specs do not rule it out.
- Bikepacking: Small enough for bike bags: packs to 1.9 litres
- Winter mountain: Comfort rating 14 °C: too cold for winter nights
From the maker's stated use and the published specs.
- Summer wild camp: 7/10 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: 3/10 UK winter or high ground. Below freezing, strong wind, possibly snow. Below this trip's minimum: needs warmth 9+ (comfort -5 °C or colder).
- Weight: 10/10 How much it adds to your pack, compared with the whole market.
Comfort 14 °C, limit 10 °C (ISO 23537).
Hut nights and warm summer trips where it stays above about 14 °C
- Zip
- Full, left side
- Comfort
- 14 °C
- Limit
- 10 °C
- Fill
- 600 fill down
- Weight
- 450 g (Regular)
Packed size 1.9 L, 24 x 10 x 8 cm Compare with a 2-litre bottle
Shorter than a 2-litre bottle and about as wide as one. Drawn to scale.
Where to buy
Alpinetrek £109.46 In stock. Free delivery. Regular, Admiral Blue. Free UK delivery from £85.
View at shop: AlpinetrekUltralight Outdoor Gear £124.99 In stock. Free delivery. Free UK delivery over £15.
View at shop: Ultralight Outdoor GearMountain Equipment £140 Out of stock. Regular and Long both out of stock when checked. Free UK mainland delivery over £50.
View at shop: Mountain EquipmentPrices 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 1/10How cold a night you can sleep comfortably through. 1: A real weak point.
Mountain Equipment lists comfort 14 °C, limit 10 °C and extreme -1 °C. A comfort figure above 10 °C is the lowest band. The maker's own 'Good Night's Sleep' rating of 8 °C is a house figure and is not used for the score.
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 10/10How much it adds to your pack. 10: The best you can buy for this.
450 g for the Regular size (Mountain Equipment's figure) is under 700 g, the top band.
Packed size
From maker's figures 10/10How much room it takes in your rucksack. 10: The best you can buy for this.
The maker gives no litres. Its pack size of 24 x 10 x 8 cm, as a box, is 1,920 cm³, about 1.9 L, under 4 L, the top band.
What reviewers say (out of 10)
Ratings marked * are from reviews and are not part of the trip score. They are reviewers' scores, not our own measurements. How we score
Comfort to sleep in*
Estimate: only 1 review about comfort to sleep in (fewer than the 3 we need, so never above 8) 8/10How comfy the shape, hood and fabric feel; not the temperature rating.
1 review on comfort to sleep in, e.g. "Die Kapuze ist außerdem per Kordelzug anpassbar.".
Zip*
Estimate: only 1 review about zip (fewer than the 3 we need, so never above 8) 8/10How smoothly the zip runs without snagging.
1 review on zip, e.g. "wenn ich drinnen liege mit der rechten Hand bequem öffnen und schließen".
In short
Good for
- Hut nights and warm summer trips where it stays above about 14 °C
- Travel and fast-and-light trips where 450 g and a 1.9 L pack size matter most
- Use as a lightweight liner-style bag inside a warmer bag
Strengths
- Very light at 450 g (Regular), and packs to about 1.9 L
- 130 g of 80/20 duck down at 600 fill power, with recycled shell and lining fabric
- 165 cm side zip from head to toe, so it can be opened right out on warm nights
- Mountain Equipment's Good Night's Sleep Guarantee lets you swap to a warmer bag if this one is not warm enough
Weaknesses
- Warm weather only: comfort 14 °C and limit 10 °C, so it is too cold for most UK wild camps outside mid-summer
- Standard (untreated) down, so it loses warmth if it gets damp from condensation or a wet tent
- No independent tests or reviews found, 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 (3)
- Mountain Equipment UK: TransAlp Sleeping Bag (weight, fill, comfort, limit and extreme ratings, price)
- Ultralight Outdoor Gear: TransAlp Down Sleeping Bag (standard pack size 24 x 10 x 8 cm, Regular 444 g, Long 476 g)
- Bergzeit Magazin: Transalp Schlafsack von Mountain Equipment im Test (Regular, one night at about 15C, German)