The bags most UK campers actually buy. Synthetic fill is cheaper, copes with damp and dries fast, at the cost of weight and pack size.
18 products, lightest first
Lightweight synthetic#1Rab
960 g synthetic mummy with an ISO comfort of +5 °C, from about £120 at UK specialists.
From
£111.95
at Absolute Snow
Best for kids#2Mountain Warehouse
A child-sized envelope bag rated for mild summer camping.
From
£24.99
at Mountain Warehouse
7 photosBudget trekking#3Decathlon Simond
An ISO-rated synthetic trekking bag at a campsite-bag price.
From
£64.99
at Decathlon
6 photosRoomy trekking#4Sea to Summit
Roomy relaxed-mummy synthetic bag, ISO comfort +3 °C, with a second half zip for venting.
From
£144.99
at Ultralight Outdoor Gear
5 photosMost packable#5Snugpak
UK-made Softie insulation that compresses to the size of a loaf, rated to 0 °C by Snugpak.
From
£127.50
at John Bull Clothing
8 photosBest all-rounder#6Mountain Equipment
Recycled Polarloft insulation with a genuine +1 °C ISO comfort rating at 1.2 kg.
From
£129.99
at Ultralight Outdoor Gear
2 photosPremium synthetic#7Rab
A synthetic bag with a real ISO 0 °C comfort rating, for damp trips where down struggles.
From
£142.16
at Alpinetrek
DofE value#8Vango
DofE-recommended 1.34 kg mummy with an ISO comfort of +3 °C, under £60 on sale.
From
£56.95
at Attwoolls Outdoors
Cheapest adult bag#9Mountain Warehouse
A roomy square bag for summer campsites and festivals, often half price.
From
£29.99
at Mountain Warehouse
8 photosBest for DofE#10Decathlon Simond
0 °C comfort in synthetic fill for £80: the sensible expedition bag on a budget.
From
£79.99
at Decathlon
2 photosTravel and festivals#11Snugpak
1.5 kg travel bag with a built-in mosquito net and a -3 °C brand comfort rating, from about £50.
From
£49.99
at Summits
7 photosBest value#12Vango
A lab-tested ISO comfort rating of +2 °C for around £40, from the brand on every campsite.
From
£39.99
at Norwich Camping & Leisure
5 photosCheapest 3-season#13Vango
A square-cornered campsite bag with an ISO +2 °C comfort rating for about £34.
From
£33.99
at WM Camping
7 photosBudget mummy#14Highlander
A 0 °C mummy bag from the Scottish brand, for DofE and spring camps.
From
£59.95
at Camping Online
7 photosWarmest#15Vango
An ISO-rated -1 °C comfort bag for under £50. Heavy at 1.9 kg, so one for the car boot, not the rucksack.
From
£39.95
at Attwoolls Outdoors
Cheapest 0 °C#16Mountain Warehouse
0 °C comfort for £35 on sale. Heavy, but hard to beat for the money.
From
£34.99
at Mountain Warehouse
4 photosBest for car camping#17Decathlon Quechua
A roomy rectangular campsite bag with a real 0 °C ISO rating.
From
£59.99
at Decathlon
4 photosBest double#18Highlander
A two-person campsite bag for under £40, ISO rated for summer nights.
From
£36.92
at Wylies Outdoor World
Weights and sizes are manufacturer figures. Prices were checked on 31 October 2026 and change daily, so confirm on the retailer's site.
Synthetic insulation keeps most of its warmth when damp and dries overnight. For wet UK camping, DofE expeditions and anyone on a budget it is the sensible choice.
"3 season" means different things to different brands. Compare the comfort temperature instead, and check whether it is an ISO 23537 figure or the brand's own estimate.
Expect 1 to 1.5 kg and a packed size the shape of a loaf of bread for a 3-season synthetic bag. Fine for car camping and short walks, tiring on a multi-day route.
A full-length two-way zip lets you vent your feet on warm nights. A shaped hood with a drawcord adds several degrees of real warmth.
Methodology
Specs are manufacturer figures, or a UK specialist retailer's spec sheet where the maker is vague. Prices were checked on 31 October 2026. Our ratings are editorial and explained on the how we test page.
