Written by the Travel Gear team. Last updated: May 2026.
A travel backpack is one of the most versatile pieces of luggage you can own. Unlike a wheeled suitcase, a backpack works on cobblestones, stairs, dirt tracks, and crowded buses. It fits in overhead lockers, goes under your seat, and keeps your hands free. But choosing the wrong one can mean back pain, overpacking, and frustration. This guide helps you get it right.
Step 1: Choose the Right Size
Travel backpack capacity is measured in litres. Here's a practical guide:
- 20–30L: Day pack / carry-on only — ideal for weekend trips or minimalist travellers
- 30–45L: Carry-on compatible for most airlines — the sweet spot for 1–2 week trips
- 45–60L: Checked luggage territory — suits longer trips or travellers who pack more
- 60L+: Extended travel or trekking — usually too large for carry-on
For most Australian travellers doing 1–2 week international trips, a 35–45L pack that meets carry-on requirements is the ideal choice. Browse our travel backpack range to compare options by size and style.
Step 2: Carry-On Compatibility
If you want to avoid checked baggage fees, your backpack must meet your airline's carry-on size limits. Australian airlines typically allow 115cm linear (56 x 36 x 23cm) for carry-on. Always check the specific dimensions of any backpack against your airline's current limits — Jetstar is stricter than Qantas.
Step 3: Key Features to Look For
Access Style
- Top-loading: Traditional hiking style — durable but requires unpacking to find items at the bottom
- Panel-loading (clamshell): Opens like a suitcase — much easier to pack and access, preferred for travel
Back System
- Padded shoulder straps and hip belt for comfort on longer carries
- Ventilated back panel to reduce sweating
- Adjustable torso length for a proper fit
Organisation
- Laptop sleeve (padded, ideally with quick-access pocket)
- Multiple internal compartments
- External water bottle pockets
- Hip belt pockets for quick-access items
Step 4: Security Features
For travel in busy cities and tourist areas, security features matter. Look for lockable zippers on main compartments, hidden or back-panel pockets for valuables, slash-resistant fabric and straps, and RFID-blocking pockets for cards and passport. Browse our anti-theft backpacks for packs that combine all of these features.
Step 5: Pack It Right
Use packing cubes to organise clothing by category. Pack heavy items (shoes, toiletries) close to your back and at the bottom. Keep frequently needed items (passport, adapter, snacks) in easily accessible pockets. A well-packed 40L bag carries more comfortably than a poorly packed 30L bag.
Frequently Asked Questions
What size backpack fits in Qantas carry-on?
Qantas allows carry-on bags up to 115cm linear (56 x 36 x 23cm) and 7kg. Most 35–40L travel backpacks meet these dimensions, but always check the specific bag's measurements before you buy.
Is a travel backpack better than a suitcase?
It depends on your trip. Backpacks are better for adventure travel, destinations with rough terrain, and travellers who move frequently. Suitcases are better for city trips, business travel, and travellers who prefer not to carry weight on their back.
How do I pack a travel backpack efficiently?
Use packing cubes to organise clothing by category. Pack heavy items close to your back and at the bottom. Keep frequently needed items in easily accessible pockets. Rolling clothes rather than folding saves significant space.
For more on choosing the right luggage, see our best travel backpacks for Australia in 2026 and our complete packing cubes buying guide.