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Mountain Equipment

Mountain Equipment Klimatic II synthetic sleeping bag

Best use

Made for
Backpacking and wild camping
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.
  • Winter mountain: Comfort rating 4 °C: too cold for winter nights

From the maker's stated use and the published specs.

Mid Confidence: Medium
  • Summer wild camp: 4/10 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: 6/10 How much it adds to your pack, compared with the whole market.

Comfort 4 °C, limit -1 °C (ISO 23537).

Lowest price we found

£119.99 at Ultralight Outdoor Gear

In stock. Free delivery. Checked 8 Nov 2026.

RRP £140, checked 19 Oct 2026.

Go to Ultralight Outdoor Gear Compare 2 shops

Spring, summer and early autumn wild camps with nights down to about 4 °C

Zip
Half
Comfort
4 °C
Limit
-1 °C
Fill
synthetic
Weight
1.0 kg (Regular)
Packed size 11.6 L, 25 x 22 x 21 cm 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

Ultralight Outdoor Gear £119.99 In stock. Free delivery. Free UK delivery over £15.

View at shop

Mountain Equipment £140 In stock. Free delivery. Regular, Dusk. Free UK mainland delivery over £50.

View at shop

Prices 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 5/10

How cold a night you can sleep comfortably through. 5: Does the job. Average for wild-camping gear.

Mountain Equipment lists comfort 4 °C, limit -1 °C and extreme -16 °C. Comfort 4 °C is in the 0.1 to 5 °C band. The maker's own 'Good Night's Sleep' rating of -2 °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) 3/10

How 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 6/10

How much it adds to your pack. 6: A bit better than average.

The maker's headline weight for the Regular is 1,000 g, in the 1,000 to 1,299 g band. Its spec table says 940 g total bag weight, which would be the 700 to 999 g band: we use the 1,000 g headline figure as it is the one shops and the maker's product summary use.

Packed size

From maker's figures 3/10

How much room it takes in your rucksack. 3: Below average. Fine for some trips, not others.

The maker gives no litres. Its packed size of 25 x 22 x 21 cm, as a box, is 11,550 cm³, about 11.6 L, in the 9 to 12.9 L band. Ultralight Outdoor Gear lists a larger 30 x 24 x 21 cm (about 15 L, the lowest band), so this is the maker's tighter figure.

In short

Good for

  • Spring, summer and early autumn wild camps with nights down to about 4 °C
  • Budget three-season synthetic bag for campers who expect damp tents and condensation
  • Hikers who want a bag that takes a bit of damp better than ordinary down

Strengths

  • 90% recycled Polarloft insulation and 100% recycled 20D shell and lining
  • Full-length zip with a baffle and a collar, an anatomically shaped hood and footbox, and a compression sack included
  • Available in Regular and Long, with left or right zip in Regular

Weaknesses

  • About 1,000 g and 11.6 L packed is heavy and bulky for its warmth; a down bag at the same rating packs far smaller
  • The maker's headline weight (1,000 g) and its spec table (940 g) disagree, and shops list 1,055 g without the sack
  • Comfort 4 °C is not enough for UK nights near freezing in late autumn or winter
  • No independent tests 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 (2)
  1. Mountain Equipment UK: Klimatic II (weight, packed size, comfort, limit and extreme ratings, price) Specs, 19 Oct 2026. Used for: warmth, weight, packed size
  2. Ultralight Outdoor Gear: Klimatic II Synthetic Sleeping Bag (Regular 1,055 g without storage bag, pack size 30 x 24 x 21 cm) Specs, 19 Oct 2026