Best sleeping bags for cold nights & power cuts (2026)
A proper sleeping bag is the most effective way to stay warm through a cold night with no heating — a winter power cut, a draughty house, or camping. It traps your body heat far better than piling on blankets, and the right one keeps a person genuinely warm down to freezing and below. Here's how to read the ratings and choose.
By Tom Calder · Updated 5 November 2026 · 3 products, all price-tracked
All 3 compared
| Bag | Comfort temp | Season rating | Fill | Weight | Price |
|---|---|---|---|---|---|
 -5 °C · 3-season (4 with liner) · Softie Premier synthetic insulation · 1,500 g A warm, damp-tolerant bag for a home or car emergency kit and cold-weather use. | -5 °C | 3-season (4 with liner) | Softie Premier synthetic insulation | 1,500 g | £124.55 at Amazon as of 5 Nov 2026, 22:07 GMT · DetailsProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.In stockCheck price → |
Our verdictOur verdictResearched A dependable, UK-made synthetic bag whose insulation keeps working even when damp, making it a sensible choice for an emergency kit or an unheated home during a winter power cut. It is heavier and bulkier than a down equivalent, so it earns its place in the car boot or a cupboard rather than a lightweight hiking pack. Best for A warm, damp-tolerant bag for a home or car emergency kit and cold-weather use. Good
Worth knowing
Who shouldn't buy it: You mainly need a light bag to carry far on foot, or only ever camp in mild summer weather, where a lighter and cheaper bag will pack smaller and serve you better. Read the full review → | |||||
 5 °C · 3 season · Microfibre (synthetic polyester) · 1,400 g An affordable, machine-washable synthetic bag to keep in a home grab-bag or car for cool-weather standby. | 5 °C | 3 season | Microfibre (synthetic polyester) | 1,400 g | £35.99 at Amazon as of 5 Nov 2026, 22:07 GMT · DetailsProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.In stockCheck price → |
Our verdictOur verdictResearched A budget-friendly 3-season synthetic bag that offers reasonable warmth and easy care for the price. It is a practical home-standby or car-camping bag rather than a lightweight or genuine winter option. Best for An affordable, machine-washable synthetic bag to keep in a home grab-bag or car for cool-weather standby. Good
Worth knowing
Who shouldn't buy it: Don't buy this if you need a genuine lightweight backpacking bag or reliable sub-zero winter warmth — this is a value standby bag, not a technical cold-weather one. Read the full review → | |||||
Sold out right now (1)
The shop says these are sold out today. We check stock every hour, and each one moves back up the list when it returns.
| Bag | Comfort temp | Season rating | Fill | Weight | Price |
|---|---|---|---|---|---|
 7 °C · 1-season (warm/tropical) · Travelsoft synthetic (polyester) · 900 g A light, tiny-packing summer bag for warm-weather trips or the milder half of a grab-bag | 7 °C | 1-season (warm/tropical) | Travelsoft synthetic (polyester) | 900 g | Out of stockCheck price → |
Our verdictOur verdictResearched A well-made British warm-weather bag that packs down remarkably small and adds a handy zip-over mosquito net. It is genuinely good at its job, but that job is comfort down to about 7°C, not cold-weather survival. Best for A light, tiny-packing summer bag for warm-weather trips or the milder half of a grab-bag Good
Worth knowing
Who shouldn't buy it: Do not buy this expecting it to keep you warm through a winter power cut or a cold night below single figures. For year-round emergency warmth choose a 3-4 season bag; keep the Jungle Bag for summer use or as a packable warm-weather layer. Read the full review → | |||||
ⓘ As an Amazon Associate, PreparedBritain earns from qualifying purchases. We may earn a commission when you buy, or a fee when you request a quote, through our links. When two products are close, commission can decide which one we pick. A clearly better product always wins. Amazon prices come from Amazon's own product data and show the date and time they were retrieved. Prices at other retailers are checked by us, less often. Prices and stock can change at any time, so always check the retailer's price before you buy.
Before you buy
Read the temperature rating properly.
Sleeping bags are rated (often to the EN/ISO 23537 standard) with a 'comfort' figure — the temperature at which a cold sleeper stays warm — and a lower 'limit' figure for a warm sleeper. Use the COMFORT rating, and give yourself margin: for a UK winter power cut indoors, a comfort rating around 0°C to -5°C covers a genuinely cold night with room to spare.
Choose fill by use.
Synthetic bags are cheaper, keep insulating when damp, and are the sensible choice for home emergency use and general camping. Down bags are warmer for their weight and pack far smaller, but cost more and lose loft if they get wet — worth it if you backpack or need compactness, overkill for a bag that lives in a cupboard for a power cut.
Then shape and extras
A mummy shape with a hood traps the most heat (a lot escapes from your head), while a rectangular bag is roomier and can double as a duvet. A draught collar and a well-filled zip baffle stop cold spots. For storage, keep it loosely in the large sack it came with, not compressed, so the fill keeps its loft.
We verify every product's specifications against at least two independent sources, re-check its UK price and stock on a schedule where we can track it automatically, and cross-check safety-relevant claims against official guidance. Every review is labelled Researched or Used and reviewed by us: where we've bought a product, or been sent it free, and used it ourselves, its review says which; where we haven't, our verdict is a considered spec-and-evidence comparison, not a hands-on test. When two products are close, commission can decide which one we pick. A clearly better product always wins. Read our full methodology →
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Common questions
What temperature sleeping bag do I need for a UK winter?
Go by the comfort rating and allow margin — a comfort figure around 0°C to -5°C keeps an adult warm through a cold British night indoors with room to spare. The 'limit' rating is for a warm sleeper and shouldn't be your target.
Down or synthetic sleeping bag?
Synthetic is cheaper and keeps insulating even when damp, making it the sensible choice for home emergencies and general camping. Down is warmer for its weight and packs smaller, but costs more and loses warmth if it gets wet — best for backpacking.
Is a sleeping bag better than blankets in a power cut?
Yes — a sleeping bag traps your body heat far more efficiently than layered blankets, especially a mummy bag with a hood that stops heat escaping from your head. It's the most effective way to stay warm through a cold night without heating.
What does the season rating mean?
It's a rough guide: 1–2 season for summer, 3-season for spring and autumn, and 4-season for winter. Treat it as a starting point and check the comfort temperature, which is the more precise measure of warmth.
How should I store a sleeping bag?
Loosely, in the large storage sack it came with, rather than crammed in its compression stuff sack. Keeping the fill uncompressed preserves its loft, which is what keeps the bag warm over the years.
Do I need an expensive sleeping bag for a power cut?
No — a mid-range 3-season synthetic bag keeps an adult warm indoors through a cold night cheaply. Spend up for a down or 4-season bag only if you also camp, backpack, or need to save weight and pack size.
