Is your sleeping bag struggling to keep you warm in the winter months? Do you remember it being warmer – does it seem to have lost its warmth over the years? Or maybe you have a sleeping bag that’s better suited to the summer months and you’re about to head out in winter and don’t want to buy another sleeping bag? If this sounds like you, then read on for our 5 toasty tips for making your sleeping bag warmer.
Brrrr, winter camping can get positively arctic if your sleeping bag isn’t warm enough! Image: Sea to Summit.
Here are a few tips on how to get more warmth out of your sleeping bag:
1. Wash your old sleeping bag
If your sleeping bag is on the ‘well used’ side and doesn’t seem to be as warm as it once was, you may need to give it a good wash. Over time the oils from your skin, together with moisture caught in the filling, can cause the stuffing to clump together which prevents it from ‘fluffing up’.
The filling in the sleeping bag needs to expand and puff up filling itself with air which will trap the warmth produced by the person inside. By washing your old sleeping bag, the clean filling will fluff up when used. This traps more warm air and increases the barrier between the person inside and the cold air outside.
How to wash your sleeping bag:
- Put your sleeping bag in a pillowcase to protect the thin outer material from tearing.
- Using a front loader, wash your sleeping bag on a warm, gentle setting. (Remember to use Nikwax Down Wash if you have a down sleeping bag.)
- Dry your sleeping bag in a large tumble dryer on its lowest setting. Place a few tennis balls inside the dryer as these will smash into the sleeping bag which will break up the filling and fluff it up again.
- If you don’t have access to a dryer, you can dry the sleeping bag on the clothesline in the sun. But every half an hour or so, beat it with a tennis racket to break up the filling.
2. Add a thermal liner
If your sleeping bag isn’t rated low enough for the conditions you’re using it in, or if you’ve discovered you’re a cooler sleeper, consider adding a silk, cotton, or fleece liner rather than purchasing another sleeping bag.
In an ideal world, you would have a sleeping bag for every season. But in reality, you can make one sleeping bag a lot more versatile with a few of these hacks.
There are many different liners on the market, with our favourite being the cotton and silk versions produced by Sea to Summit. A thermal liner is made of the same material as thermal underwear and is specifically designed and rated to boost the warmth of your sleeping bag.
By adding a liner to your bag, not only will you have a great combination for winter, but you can still use the sleeping bag on its own in average conditions, and then just the liner on its own when it’s really hot! A removable liner also keeps your sleeping bag cleaner, and thus, your filling in better condition.
3. Wear thermals
Thermal underwear is the warmest set of pyjamas you will ever need when camping in cold conditions. Known as a ‘base layer’ they will trap warmth directly against your skin and make a very big difference to your comfort in cold conditions. Make sure you put your thermals on an hour or so before you go to bed in order to make sure you are nice and warm before heading off to sleep.
Nev keeping his extremities warm on a cold winter’s day in Adelaide.
4. Put on a beanie and socks
Humans lose the most heat through their heads. By wearing a beanie to bed, or tightening the hood of your sleeping bag, you can trap more warmth. When your body starts to get cold, it will take blood away from the extremities such as your feet, in order to keep it around your vital organs. By heading to bed with warm socks on, you can keep your feet warm. This means your body will keep the blood flowing to them and this all equals a better night’s sleep.
5. Eat a big dinner!
Your body will use a lot of energy to digest your dinner. All this energy will produce heat and keep you warm. By eating a decent sized dinner, and making sure it’s full of low GI carbohydrates, your body will keep burning fuel all through the night. Two-minute noodles give you enough energy for 2 minutes. A big bowl of spaghetti bolognese, on the other hand, will give you a good night’s sleep! Just don’t eat too much, and go easy on the garlic or you’ll be awake with indigestion!
No matter how old or the quality of the sleeping bag you own, these tips will help you get the best performance out it. So, hopefully, you can get a good night’s sleep even on those cold winter nights.
This post was updated for 2017.
Do you practice any of these tricks? Got any more to add? Comment below.
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I made the freezing mistake in getting too cold on my motorcycle and not taking off the waterproof liner and pants before getting into my -20c down sleeping bag in combination with a Exped winter 9cm down mat, as a result the bike gear prevented any warmth I could generate from warming the loft in the bag. It got down to only -3 and I was so cold all night thinking that my 25 year old down bag has lost it’s warmth.
The trick after some research is not to insulate the body from the bag but to allow body heat to warm the bag loft which traps the heat, and give your down bag a good shake when getting it out of the compression sack.
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It’s a shame you had find that out from a freezing cold long night, but at least you know how to stay warm for the future, Rob – cheers!
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Boil the kettle and fill up a hot water bottle, perfect for camping
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Can’t go wrong with a tried and tested hot water bottle, Linda! Cheers.
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A good sleeping bag will be EN rated but many people do forget that the EN testing is done with the use of and assumption that the mannequin/people are already wearing medium weight or winter weight thermals plus gloves and socks and a beanie.
So while adding warm clothing will boost a cheap bag doing so only allows a tested bag to achieve it’s rated minimum temperature. Also as we get older we do tend to need more sleeping insulation, it’s about 5C extra needed for every decade after 30 [ the EN testing assumes a fit and healthy young adult too] so my almost 70YO body will need a bag rated at -25C if I am camping in the Outback in winter where night time temperatures can drop as low as -12C These bags are very expensive An ultra lite synthetic blanket over the top or an overquilt is a great way to extend the temperature downwards, a synthetic quilt using 100GSM insulation can boost a bags rating by up to 10 degrees
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Thanks for sharing your expertise Ted, especially about how you need extra insulation as you get older as that’s something a lot of people might not know – cheers.
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You can pack you’re clothes that you are wearing the next day down near your feet as well. Also you can put your feet into a bag of some kind, if allowed you can make a heat shield with some green logs & direct fire back towards your shelter I’ve done this whilst it was the middle of winter & snowing on the Barrington tops national park in a swag for three week’s.
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Do not eat a big meal. Your body will divert blood from your extremities to your GI tract to digest the food leaving your feet and hands cold. Drink a decent amount of hot water/broth/tea.
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Put a hot water bottle in the sleeping bag an hour before you go to sleep. Nice and toastie!
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The hot water bottle trick is a classic, and it’s the next best thing when you’re away from your electric blanket Vaughan.
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Putting a decent layer between you and the ground makes such a difference. Having a ground mat or anything to line the tent floor under you helps. This goes for Under blowup mattresses too. It can get SO COLD otherwise.
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Insulation is everything especially in those cold winter months, Rosie. 🙂
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Foam mats are great under a blowup mattress, really insulation from the cold ground.
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And don’t forget to unpack your sleeping bag as early as possible to give it time to fully loft.
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You’re on the money there Chippy, especially if it’s a down sleeping bag. Cheers!
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Make sure your store your down sleeping bag outside of its stuffsack. An intellectual friend of mine has failed to heed my advice on this and keeps it in the stuffsack. Perhaps he is not so intellectual. Keeping it stored loosely or fully stretched out under a bed means the down is more likely to retain its memory of being able to expand fully enabling it to loft more therefore providing greater warmth. If kept in a stuff sack the down and feathers can get crushed to the extent this memory is lost with minimal lofting and decreased thermal efficiency of the bag.
Well done to Snowys for providing these helpful articles and handy hints.
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A down bag? Kept in its stuff sack? Definitely not the best way to do it that’s for sure!
Thanks for the compliment, we’re so glad you’ve enjoyed the tips in the article.
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My sleeping bag is a good quality high performance one which packs down light and small for kayaking trips but in the freezing cold of the outback it was found wanting – so I bought an el cheapo $40 bag from Target – (packing small not a problem for the Prado roof rack), and I put my good bag inside the cheap one – that extra layer of trapped air between them working wonders – and I can open up the out side bag as needed when the nights are warmer. Predawn ice on the outside of my little tent but snug as a bug inside.
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There is nothing better than feeling snug and warm when it’s icy cold outside, thanks for sharing your hack for making your sleeping bag warmer Trev.
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These are all good tips. It is important to put new socks on at bed time, so wear tomorrow’s socks. This is because socks take up moisture from the feet and when that moisture evaporates, your feet will feel cold.
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That’s an important distinction Meredith, we hadn’t thought of that but you’re right – clean socks are the way to go!
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The dog is a great foot warmer if you have it with you! Haha!
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A cute companion is almost better than a hot water bottle on a cold winter night 🙂
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Best tip: share your sleeping bag with a furry friend!
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Touché Sam – nothing like a friendly (and cuddly) portable heater to share your sleeping bag with. 🙂
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With that big meal, drink plenty of Port to stave off the cold, along with whatever other preferred tipple you may prefer.
As a bonus you may get to miss the early morning frost as well.
Assuming you made it to your sleeping bag.
The next day will be horrendous but you will sleep undisturbed.
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Too right Glenn – a cheeky glass or two always helps send you off to sleep on a cold night!
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Number 1 tip to keep warm is take your partner to bed with you. ????
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Agreed! 😀
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