Cheapest adult bag
Images: Mountain Warehouse and its retailers. Used for product identification.
Mountain Warehouse
Mountain Warehouse Summit 250
A roomy square bag for summer campsites and festivals, often half price.
- Weight
- 1,400 g
- Comfort
- +5 °Climit 0 °C
- Packed
- 23 × 36 cm
Best price found
£29.99
at Mountain Warehouse · RRP £59.99
Prices checked 31 October 2026. We may earn a commission on these links.
- Synthetic fill
- Two-way zip
Specifications
- Weight
- 1,400 g (1.6 kg long)
- Packed size
- 23 × 36 cm
- Comfort
- Comfort +5 °C / limit 0 °C
- Insulation
- Hollow fibre polyester
- Season rating
- 3 Season
- Shell & zip
- 100% polyester ripstop shell
- Rating Standard
- ISO 23537 rating, per Mountain Warehouse
- Zip
- Two-way zip, left-zip or right-zip versions
Pros & cons
- Very cheap entry point with a stated EN ISO 23537-1 comfort 5°C / limit 0°C
- Roomy envelope shape and left/right zips to join two bags
- Ripstop shell and strong customer rating
- Comfort 5°C makes it a spring/summer bag in practice; 1.4 kg and 23 x 36 cm packed is bulky for backpacking
- No independent editorial review found; temperature figures differ between MW regional sites
Sources for this product
More synthetic bags
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7 photosBest valueVango
Vango Nitestar Alpha 250
A lab-tested ISO comfort rating of +2 °C for around £40, from the brand on every campsite.
- Weight
- 1.6 kg
- Comfort
- +2 °Climit -4 °C
- Packed
- Not stated by maker
- Synthetic fill
- Draught collar
- Two-way zip
Full specs, 4 retailers →View DealFrom
£39.99
at Norwich Camping & Leisure
7 photosWarmestVango
Vango Nitestar Alpha 350
An ISO-rated -1 °C comfort bag for under £50. Heavy at 1.9 kg, so one for the car boot, not the rucksack.
- Weight
- 1.93 kg
- Comfort
- -1 °Climit -7 °C
- Packed
- ≈ 30 × 22 cm, per Attwoolls
- Synthetic fill
- Draught collar
- Two-way zip
Full specs, 4 retailers →View DealFrom
£39.95
at Attwoolls Outdoors
8 photosBest all-rounderMountain Equipment
Mountain Equipment Klimatic III
Recycled Polarloft insulation with a genuine +1 °C ISO comfort rating at 1.2 kg.
- Weight
- 1.22 kg
- Comfort
- +1 °Climit -5 °C
- Packed
- 25 × 22 × 21 cm
- Synthetic fill
- Recycled fabrics
- Full-length zip
Full specs, 4 retailers →View DealFrom
£129.99
at Ultralight Outdoor Gear
