Budget trekking1 / 7
Images: Decathlon Simond and its retailers. Used for product identification.
Decathlon Simond
Decathlon Simond MT500 5 °C
An ISO-rated synthetic trekking bag at a campsite-bag price.
- Weight
- 1,050 g
- Comfort
- +5 °Climit 0 °C
- Packed
- 35 × 19 cm
Best price found
£64.99
at Decathlon · Price from Decathlon's UK search listing
Prices checked 31 October 2026. We may earn a commission on these links.
- Synthetic fill
Specifications
- Weight
- 1,050 g
- Packed size
- 35 × 19 cm
- Comfort
- Comfort +5 °C / limit 0 °C
- Insulation
- Silicone-coated spiral polyester fibre wadding
- Season rating
- 3-season
- Shell & zip
- 100% polyamide 38 g/m², 20 denier; Mummy with layered wadding
- Rating Standard
- ISO 23537 rating
- Zip
- 3/4-length double-slider zip with anti-snag system and…
Pros & cons
- Synthetic fill keeps insulating when damp
- Low price for a lab-rated 3-season mummy
- About 220 g heavier and bulkier than the MT900 5°C down bag
- No independent review of this exact model found
Sources for this product
More synthetic bags
Full comparison →
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
Cheapest adult bagMountain Warehouse
Mountain Warehouse Summit 250
A roomy square bag for summer campsites and festivals, often half price.
- Weight
- 1.4 kg
- Comfort
- +5 °Climit 0 °C
- Packed
- 23 × 36 cm
- Synthetic fill
- Two-way zip
Full specs, 1 retailer →View DealFrom
£29.99
at Mountain Warehouse
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
