A sleeping bag that keeps you warm in the cold weather, doesn’t get too hot in warmer climates, weighs nothing, costs next to nothing, packs small and looks good. Yes, please! Read on for our guide to choosing not simply the best sleeping bag, but the best sleeping bag for you.
Latest update: July 2019
There’s no need to spend a fortune. It’s all about knowing whether you need lightness, superior warmth or just a basic sleeping bag.
If you’re planning to bivvy half-way up a snowy mountain, then you won’t be buying a £15 sleeping bag from Aldi. If you’re a casual camper, it’s unlikely you’ll want to pay £300+ for an expedition-quality sleeping bag. Most of us, though, fall somewhere in between – wanting a good compromise between cost and comfort.
This guide doesn’t cover the cheap, festival-type bags, nor the high-end technical kit. Instead, we’ve been looking at well-designed, comfortable and affordable bags that you can rely on.
We took a budget of between £40 and £140. This might seem a little high, but we aimed to find three-season options that would stand up to fairly regular use and would last for years and years. Bear in mind that three seasons in the UK won’t include late autumn or early spring – so essentially, we’re looking at May to October. We set a maximum weight of 2kg.
For our favourite cold weather sleeping bags, zoom to the end of the article. We’ve selected three we’d personally recommend.
You really don’t need this guide…
If you camp a couple of times a year in spring, summer or early autumn and don’t have to carry your kit on your back, then virtually any sleeping bag will do the job.
Our advice would be to set a budget and then choose a bag that’s as close to the comfort of home bedding as you can get.
We’ve heard good things about the Baavet wool-filled, UK-made duvets, which are light and also regulate body temperature well. They’re not cheap, but they should last a VERY long time. Duvets, of course, have the bonus of being usable at home and when camping, so you’ve cut your kit budget!
Rectangular sleeping bags
For a sleeping bag that’s as close to home bedding as possible, go for a rectangular bag like the ones shown below. Cotton will feel nicer than nylon. One of the newer quilt-like sleeping bags will give you more versatility. These bags tend to be heavier (up to 3.5kg) and won’t make small packs.
We personally don’t like double sleeping bags because the packs are larger and you don’t get the versatility of having two separates. However, there are some temptingly comfortable ones around like this Active Era sleeping bag that also makes two singles.
If you want more versatility, then consider spending a bit more on a cross between a duvet, a sleeping bag and a poncho – like the Vaude Navajo (see the recommendations below).
Our choice for duvet-style sleeping bags
Everyone loves their Jungle Blanket
We’ve had a lot of readers singing the praises of the Snugpak Jungle Blanket. It’s insulated, easy to wash, folds small, works well as a cover in warm weather and even better as an additional layer when it’s cold. Wrap up in it by the campfire too. Four sizes and from around £25.
Use a sleeping bag liner
A cotton or silk sleeping bag liner can keep you from sticking to cheaper, shiny bags. It can add a layer of warmth, or it can keep you covered if you need to unzip to let some cool air in. Plus, you’ll be able to wash it more easily, saving you from washing your bag too often.
Our favourite sleeping pods
Hi-Gear, Skandika and Silentnight make some cosy sleeping pods that should keep you warm through three seasons. They’re quirky-looking oval sleeping bags.
They’re all classed as three-season, but remember that extra room inside means they won’t be quite as warm as a close-fitting mummy bag with good insulation. However, they certainly are comfortable to sleep in.
And now for our favourites – our top 12 sleeping bags
Vaude Navajo 900 – around £80
A clever option that can be a sleeping bag and a blanket. It’s a spacious, warm rectangular sleeping bag made with environmentally friendly bluesign® certified materials. The Sensofiber fill reflects body heat yet efficiently transfers moisture away from the body. Two can be connected. Very cosy. Choice of warmth ratings with the 900 our three-season choice.
- Comfort 2°C and limit -3°C
- Pack size: 25 x 30
- Weight: 1.8kg
- Length: 220cm
A bargain option– Mountaineers brand – around £30
- Comfort 15°C, limit 0°C
- Pack size: 37 x 26cm
- Weight: 1.4kg
- Length: 220cm
The Kelty Tuck range – £30-£90
Offered in five performance levels and women’s options: -4, -6, -7 and even -18 and -29 (although they don’t make it clear whether this is the extreme limit or the low limit). They’re lightweight and have a rounded, oversized mummy shape that opens at the bottom so you can stick your feet out in warmer weather. We’ve liked this US brand for its day shelters, but it can be hard to find their kit in the UK.
- Temperature range stated as -4 through to -29 (depending on model), but it’s not clear how this relates to the comfort and limit ratings
- Pack size: 20 x 33cm to 21 x 44cm
- Weight: 1.36kg to 1.5kg
- Length: 183cm to 213cm
Outwell Cardinal – around £65So, this one weighs 2.6kg, which is over our limit. However, it’s such a cleverly designed bag that we had to include it. It’s super-comfortable and very versatile in that you can open it up or snuggle down as the temperature dictates. It’s slightly tapered to trap warmth but is still extra wide, and it has a built-in pillow.
- Comfort 2°C and limit -4°C
- Pack size: 48 x 46 x 25 cm
- Weight: 2.6kg (heavier than our limit but it IS nice)
- Length: 220cm
Mountain Equipment Starlight – around £100
A comfort fit and wider foot area, this range comes in larger sizes and a women’s cut. There are also higher spec versions in the range, but the Starlight II three- to four-season one looked good enough!
- Comfort 3°C and limit -2°C
- Pack size: 22 x 29cm
- Weight: 1.42kg
- Length: 185cm
Nordisk Hjalmar -2 – around £80
Hjalmar is a rare thing – a rectangular bag that’s still light and warm and has a soft brushed lining. Zip two together to make a double or use open as a blanket. Don’t buy the summerweight version (Hjalmar 10) by mistake!
- Comfort 4°C and limit -2°C
- Pack size: 25 x 31-37cm
- Weight: 1.23kg
- Length: 190cm
Trespass Echotec – around £55
A great and affordable sleeping bag, if a bit mummyish. The Trespass Echotec is waterproof as well as warm.
- Comfort 5°C and limit -10°C
- Pack size: 45 x 20cm
- Weight: 2.2kg
- Length: 200cm
Got a favourite sleeping bag? Do leave a comment below and share your finds.
Mountain Hardwear Lamina Z Spark 34 – around £110
More of a mummy shape but with a wider area for your feet. Fleece-lined for comfort. The Lamina Revamp ripstop shell repels water, and there’s a full-length zip. It’s filled with Thermal Q synthetic insulation.
- Comfort 6°C and limit 1°C
- Pack size: 15 x 30cm
- Weight: 0.94kg
- Length: 198cm
Two Quechua sleeping bags that look great and work well. The Forclaz cleverly combines mummy features with the comfort of a rectangular bag. The Arpenaz is soft cotton. Not quite as warm as our other picks.
- Comfort 10°C and limit 5°C
- Pack size: Depends on size chosen (Forclaz)
- Weight: Around 1kg (Forclaz), 2kg (Arpenaz)
- Length: 170-200 (Forclaz), 190cm (Arpenaz)
Vango Cocoon 250 – around £35
A comfort shape with wriggle room. It has a good non-slip fabric too.
- Comfort 3°C and limit -3°C
- Pack size: 43 x 25cm
- Weight: 1.7kg
Wouldn’t I be warmer in a mummy sleeping bag?
Sleeping bags keep you warm by trapping your body heat in an enclosed space. That’s why expedition bags are always tight mummy-shapes. This type of bag can be claustrophobic, though, especially for people who move around a lot in their sleep. Rectangular bags, like the ones we mentioned above, are great when weight and size don’t matter.
For the in-between campers, though, the compromise is a slightly larger mummy-style – sometimes called a comfort-fit mummy. These may have a bit more width and a wider foot area. If you’re taller than average, look for bags that come in a longer length. Some manufacturers make women’s versions, which will be shorter and have a bit more width in some areas.
Weight and size
Choosing a bag that’s warmer than you need will add weight. In fact, unless you’re backpacking, weight probably matters less than pack size. Even when packing a car for camping or using a campervan, you’ll want to save space.
While we’re on the subject of packing your sleeping bag – don’t leave it compressed in its sack for long periods or you’ll damage its ability to hold heat.
Waterproofing and washing
Only sleeping bags made for extreme conditions and for bivvying will be properly waterproof. Many good sleeping bags, though, are treated with durable water repellent (DWR), which causes water to bead on the outer shell rather than soak in. It will wear off after time and washing.
Sleeping bags stuffed with synthetic fibre are easy to wash in the machine. They’re best dried outside in the sun and wind, but they can go into the dryer too. Don’t use too high a heat and turn the bag inside out half-way through the cycle. It can be hard to tell if the insulation is completely dry, so leave it out to air for as long as you can.
Temperature ratings and the seasons
Our first tip is an easy one – choose a bag that offers you a bit more warmth than you think you’ll need. You never know when you might want to camp at chillier times, and it’s easier to unzip and leave a leg out in the breeze if you get too warm than it is to start adding layers if you’re cold. However, there’s no point in adding bulk and weight with too warm a bag if you’ll never sleep in near-zero conditions.
Manufacturers usually show a ‘comfort’ rating.
- Upper limit – the highest temperature that a ‘standard’ man would be comfortable without sweating, with arms outside the bag and the bag unzipped.
- Comfort – the temperature a ‘standard’ woman can expect to sleep comfortably.
- Lower limit – the temperature that our ‘standard’ man can sleep for eight hours in a curled position without waking up.
- Extreme – the limit at which the bag will keep you alive. It’s NOT an indication of the lowest temperature at which you could use the sleeping bag comfortably. Most of us (Arctic explorers aside) can ignore this rating and focus only on the comfort guide.
The lowest rating shown by manufacturers tends towards optimism. We’d always add on a little to be on the safe side.
The other way of rating sleeping bags is using seasons. Remember, though, that it also depends on where you’re sleeping. Having just slept in a bivvy hammock on May 1 in Yorkshire, I can tell you that a three-season bag is not warm enough. If you’re on an insulated mat inside a warm tent or in a campervan, then you’ll probably be fine.
- Season one is summer in mild climates
- Season two is like UK late spring to early autumn
- Season three is chilly nights but without frost
- Season four is cold winter nights with frost or snow.
Our recommended three-season bags have a comfort rating that will allow for some cold weather nights (under canvas or in a campervan).
Why we’ve chosen a synthetic filling
We started to write a section about the differences between down and synthetic fillings – down is lighter in weight for equivalent warmth, but more expensive and harder to care for; synthetic tends not to keep its fluffiness for as long, but isn’t as affected by damp conditions, and so on….But here’s why it doesn’t matter.
Very few of us need the weight reduction that down offers. More importantly, can we sleep well wondering if the down has been plucked from live (and terrified) birds or from birds force-fed for foie gras?
We’ve come across a number of manufacturers who don’t just abide by codes of ethics for sourcing their down, but are very specific about not using live-plucked or foie gras by-products. Rab, for example, say their down “is traceable under the European Down & Feather Association Codex. This code of conduct determines the source of down; ensuring that it is a byproduct of a slaughterhouse or harvested during moulting periods and not illegally live plucked”. Katabatic give access to a Track my Down programme to trace the down’s provenance. Patagonia, Montane and Marmot are among the others. Some companies, however, are vague with their reassurances of “sustainable methods” and “supply chain control”. Thermarest, interestingly, say nothing about their down production, but their bags are made in China.
If you really want down (and nothing insulates as well), then here’s the order of priority – 1. Secondhand. 2. Harvested from moulting or nests. 3. Plucked from birds slaughtered for meat. Here’s more info on down production, and don’t forget to check up on the manufacturer before buying.
We’ve decided it’s better for the birds to go for a synthetic sleeping bag – and better for camping unless you absolutely need the lightest weight. Have a look at our recommendations for down-free padded jackets too.