Travelling with only carry-on luggage offers significant advantages: no checked bag fees, no waiting at baggage claim, no risk of lost luggage, and complete mobility at your destination. But successfully travelling carry-on only requires choosing a backpack that meets airline size restrictions while providing enough capacity for your journey. This guide explains everything you need to know about carry-on backpack selection.
Understanding Airline Size Restrictions
Airlines impose size limits on carry-on luggage, and these limits vary between carriers. Understanding these restrictions is essential before purchasing a carry-on backpack.
Qantas: 56cm x 36cm x 23cm, 7kg
Virgin Australia: 56cm x 36cm x 23cm, 7kg
Jetstar: 56cm x 36cm x 23cm, 7kg
Rex: 55cm x 40cm x 23cm, 7kg
International (typical): 55cm x 40cm x 20cm, 7-10kg
Note that these dimensions include all handles, wheels, and external pockets. A backpack that measures 56cm to the top of its main compartment but has a top pocket extending beyond that may exceed limits. Weight limits are often more restrictive than size—7kg doesn't go as far as many travellers expect.
The "Personal Item" Option
Most airlines allow a smaller personal item in addition to your carry-on. Dimensions typically around 40cm x 30cm x 15cm accommodate a small backpack, handbag, or laptop bag. Some travellers use a compressible daypack that fits inside their main pack during flights but serves as a separate bag at their destination.
Always Check Your Specific Airlines
Size and weight limits change, vary by route, and differ between fare classes. Before any trip, confirm current restrictions for your specific flights. Budget airlines are often stricter than full-service carriers, and enforcement varies significantly.
Ideal Carry-On Backpack Features
Beyond meeting size restrictions, the best carry-on backpacks include features that make travel smoother and more organised.
Access and Organisation
- Clamshell opening: Full-zip panels that open like a suitcase provide visibility and easy packing
- Front panel access: Opening from the front rather than top allows access while upright
- Laptop compartment: Dedicated padded sleeve, ideally with external access for security screening
- Internal compression: Straps or panels that secure contents and prevent shifting
- Multiple compartments: Separation between clothes, electronics, and accessories
Comfort Features
You'll carry your pack through airports, train stations, and cities. Comfort features matter even for non-hiking use.
- Padded shoulder straps: Wide, cushioned straps reduce shoulder pressure
- Hip belt: Even a simple webbing belt helps for longer carries
- Back panel padding: Cushions the pack against your back
- Hide-away straps: Ability to stow straps when checking the bag or for clean appearance
Security Features
Airports and travel environments present theft risks. Helpful security features include lockable zippers that accept small padlocks, hidden pockets for valuables, RFID-blocking pockets for cards and passport, and slash-resistant materials and straps.
Capacity Considerations
Carry-on backpacks typically range from 35-45 litres. The right size depends on your packing style, trip duration, and destinations.
Weekend trips (35-38L): Minimalist packers can manage indefinitely at this size
Week-long trips (38-42L): Comfortable for most travellers with efficient packing
Extended travel (42-45L): Maximum capacity while meeting most airline limits
Remember that larger packs tempt you to pack more. A 40L pack packed efficiently often contains the same essentials as a stuffed 45L pack, while remaining more comfortable to carry and less likely to attract airline scrutiny.
Packing Strategies for Carry-On Travel
Successful carry-on travel depends as much on packing strategy as bag selection. These techniques maximise your limited space.
The Capsule Wardrobe Approach
Select clothing items that mix and match in multiple combinations. Choose a neutral colour palette where tops and bottoms interchange. Plan for laundry access rather than packing a fresh outfit for every day. Merino wool and technical fabrics resist odours, extending wear between washes.
Roll and Compress
Rolling clothes instead of folding reduces wrinkles and saves space. Packing cubes compress clothing and keep items organised. Compression sacks work well for bulky items like jackets or sweaters.
Wear Your Bulkiest Items
Boots, heavy jackets, and bulky sweaters take up significant pack space. Wear these items during transit instead of packing them. A loaded jacket and hiking boots dramatically reduce what needs to fit in your bag.
Toiletries and Liquids
Liquids restrictions often challenge carry-on travellers. All liquids in carry-on must be in containers of 100ml or less, fitting within a single transparent 1-litre resealable bag.
Managing the Liquids Rule
- Solid alternatives: Solid shampoo bars, toothpaste tablets, and solid deodorant eliminate liquid needs
- Decant products: Transfer regular products into 100ml containers
- Buy at destination: Purchase toiletries after arrival for longer trips
- Multi-purpose products: Combined shampoo/conditioner, tinted moisturiser with SPF
Essential medications are generally exempt from the liquids rule but should be in original pharmacy packaging with your name. Carry a doctor's letter for prescription medications, especially when travelling internationally. Keep medications in your personal item for easy access if questioned.
Electronics and Security Screening
Laptops and large electronics must be removed from bags at Australian security screening. Packs with dedicated, easily accessible laptop compartments speed this process significantly.
Streamlining Security
Pack with screening in mind. Laptops in an external compartment slide out easily. Keep your liquids bag accessible for removal. Wear slip-on shoes for faster screening. Having a predictable system reduces stress and speeds your progress through security.
When Carry-On Doesn't Work
Carry-on travel isn't always practical. Recognise situations where checked luggage makes sense:
- Sports equipment: Surfboards, skis, and golf clubs can't carry on
- Extended cold-weather trips: Bulky winter gear exceeds carry-on capacity
- Work tools or specialty equipment: Some items can't be packed in carry-on
- Duty-free purchases: Liquids bought airside must often be checked on connections
For these situations, choose a carry-on backpack that works well as a personal item, complementing a checked bag rather than replacing it.
Making Your Selection
Before purchasing a carry-on backpack, consider your typical travel patterns. How long are your usual trips? What airlines do you fly most frequently? How do you travel at your destination—mostly transport, or significant walking? Do you need to look professional on arrival?
The ideal carry-on backpack balances capacity with airline compliance, comfort with organisation, and durability with weight. Take time to research options, try packs on with weight if possible, and read reviews from travellers with similar needs.
With the right carry-on backpack, you'll enjoy the freedom and efficiency of luggage-light travel, moving seamlessly from plane to destination without the hassle of checked bags.