How to choose a sleeping bag for Australian travel
- Written by: The Times
Start with the coldest night you expect, then think about how you sleep and how far you’ll carry the bag. Those three things matter more than the price tag.
A sleeping bag can feel warm in the shop and hopeless at two in the morning. The temperature drops, the ground feels cold through the mattress and you start pulling tomorrow’s clothes out of your bag to wear them all at once.
The right sleeping bag depends on the trip. For a guided Kimberley camping tour, you’ll want to know what bedding the operator supplies. For a winter road trip through inland Australia, overnight temperatures may matter more than the warm afternoons. And if you’re carrying everything on a multi-day hike, the size of the bag when packed can be worth paying for.
Read the comfort rating first
A sleeping bag with −5°C in its name could have a comfort rating several degrees warmer. Look at the specifications to see which number the manufacturer is advertising. Where a bag has been tested to ISO 23537, you’ll usually see some or all of these ratings.
| Rating | What it means when you’re shopping |
|---|---|
| Comfort | The best starting point for most buyers, especially if you tend to feel the cold. |
| Lower limit | A colder threshold based on a warmer reference sleeper curled up. Useful context if you usually sleep warm. |
| Extreme | An emergency survival threshold. Use the comfort rating to plan your trip. |
Check the overnight low for where you’ll actually camp, including the elevation and time of year. If you expect nights around 5°C, a bag with a comfort rating around 0°C gives you some room for a colder night. How much margin you need depends on how you sleep, what you’ll wear and the insulation beneath you. If a listing gives only one temperature and leaves the rating unclear, ask the retailer before buying.
Down or synthetic? Decide how much the bag will travel
Synthetic insulation is usually the better-value choice for car camping, a caravan or the occasional guided trip. It generally handles damp conditions better than down and tends to dry faster. The trade-off is bulk. A warm synthetic bag can take up a fair bit of a suitcase or backpack.
Down insulation makes sense when you’ll carry the bag for several days or need to fit it into a restricted luggage allowance. Down generally provides more warmth for its weight and packs smaller. It costs more and needs to be kept dry, so use a waterproof stuff sack or pack liner if you’re hiking.
Compare bags with similar comfort ratings, then check their actual weight and packed dimensions. That tells you what you’re getting for the extra money.
Choose a shape you can sleep in
A rectangular bag gives you room to bend your knees and turn over. Many unzip flat, which makes them handy as a quilt on milder nights. They suit car camping and caravan trips where there’s space to spare.
A mummy bag tapers towards the feet and usually has a fitted hood. It’s an efficient shape for cold weather and hiking. If you sleep on your side or move around a lot, try a roomier mummy or semi-rectangular bag. A narrow bag can feel restrictive by the time you’ve zipped it up and pulled the hood around your shoulders.
Check the maximum sleeper height and the width through the shoulders and hips. If you can try the bag in store, zip it up and roll onto your side. You’ll learn more in 30 seconds than you will from the picture on the packaging.
Budget for what goes underneath
A good sleeping bag can still feel cold on a thin or uninsulated mattress. If the ground is cold, you need insulation beneath you as well as around you. When comparing camping mats, look for the R-value. A higher number means more resistance to heat loss through the mat.
A thick airbed can feel comfortable under your hips and still offer little insulation. A stretcher gets you off the ground, but you can still feel the cold underneath as air moves below it. If you’re buying for cool-weather camping, price the bag and the mat together.
What I’d buy for each kind of trip
| Your trip | Where I’d start |
|---|---|
| Summer weekends by the coast | A light rectangular synthetic bag with a full-length zip so you can open it when the night stays warm. |
| A guided Kimberley camping tour | Ask whether the operator supplies a sleeping bag, mattress or swag, and what overnight temperatures to expect on your departure. Check the luggage limit before buying. |
| Winter road trips and inland camping | A bag with a comfort rating below the expected overnight low, paired with an insulated mat. If the car carries it, prioritise warmth and room over packed size. |
| Multi-day hiking | Compare the weight and packed size of down and synthetic bags at the same comfort rating. Spend more on down if the space and weight savings matter on the trail. |
| Caravan or campervan travel | A roomy rectangular bag you can unzip like a quilt, or two separate bags if one of you sleeps warmer than the other. |
Before putting a bag in your trolley, check the comfort rating, the fit and the packed size. If it’s mainly for weekends away in the car, I’d put the money into a comfortable bag and a decent mat. If it’s going on your back, that’s when I’d pay extra for a bag that packs down small. Either way, buy for the coldest night of the trip. On the warmer nights, you can always open the zip.