Most packing guides are written for American airlines. Here are the rules that actually apply to a Friday flight out of Sydney.
Search "how to pack carry-on only" and nearly every result is written for an American or British airline, with allowances that don't match a single carrier you can actually book here. Australians fly domestically more than almost anyone, and the rules that matter for a weekend away are Qantas, Virgin and Jetstar. So this is the local version, with the real numbers, current for 2026 and the change Jetstar is making from February 2027.
The hardest part used to be the simplest thing about it. That is changing for one airline, so here is exactly where each one stands now.
The one that changed: Jetstar
For years the three big domestic airlines shared one simple carry-on size: 56 by 36 by 23 centimetres. Qantas and Virgin still do. Jetstar is the one to watch, because from 2 February 2027 it is scrapping the old free 7kg carry-on and splitting it in two.
Here is where each airline lands:
- Qantas: one carry-on up to 56 by 36 by 23 cm, up to 10 kg, or two items to 10 kg each on many fares. Free.
- Virgin Australia: one overhead bag up to 56 by 36 by 23 cm at 8 kg, plus a small personal item under the seat. Free.
- Jetstar, from 2 February 2027: your free bag becomes one small under-seat bag, 40 by 30 by 20 cm. To put a full-size 56 by 36 by 23 cm bag (up to 10 kg) in the overhead locker, you buy Priority Carry-on, from $25 one-way and up to around $52 by route, with priority boarding included.
So the old trick of packing light and clearing all three no longer holds for Jetstar. On Qantas and Virgin, a bag built to 56 by 36 by 23 cm still walks straight on for free. On Jetstar you now have a choice: travel light enough for the little under-seat bag, or pay for the overhead. Either way, it still beats checking a bag.
What it costs to get it wrong
The reason the weight matters is what sits on the other side of it. On Jetstar, adding a checked bag at the airport is $120 for the first one, and going over your allowance costs $30 for every extra kilogram. A weekend bag you thought was fine, weighed at the gate and found to be over, can turn into a three-figure fee before you've even boarded. Packing to the limit on purpose is how you make sure the number you pay is zero.
The weekend, packed
Two or three days needs far less than the bag you'd instinctively pack. Here's the whole kit for a weekend, and it sits comfortably under 7 kilograms:
- One outfit worn onto the plane, ideally the bulkiest one, jacket and heavier shoes included.
- One spare outfit, plus a second top. Not three of everything.
- Underwear and socks per day, rolled, not folded.
- A single toiletry pouch, travel sizes, kept to the essentials you'll actually reach for.
- One cable and charger pouch, so the bag never gets turned inside out at security.
- The chargers, a book or tablet, and whatever your weekend actually needs. Not what it might need.
Pack to the weight on purpose, and a weekend fits with room to spare.
Roll soft items rather than folding them. Rolling saves space and creases less. Fill the gaps, shoes and corners, with socks and small items. Keep anything you'll want in the air, headphones, a charger, your documents, in the top or an outer pocket so you're not opening the main compartment on a crowded plane.
The bag that makes it easy to comply
A structured bag is what turns all of this from a fiddle into a habit. A soft backpack can technically be within size and still fail at the sizer because it slumps and bulges. A bag built to hold its shape drops into the frame and stays there. The Transit 26L is sized for exactly this, structured enough to pass the sizer and roomy enough for a long weekend, with locking zips as a bonus for the trip itself. For an everyday bag that doubles as a weekender, the Flow 22.5L holds its shape the same way in a lighter, slimmer build.
Get the bag right once and the rest becomes routine. Friday afternoon, Sydney to Melbourne, a bag packed the night before that you already know clears the frame and the scales. You walk on, you stow it overhead, and when you land you walk straight out. No counter, no carousel, no fee. That's the entire point of learning the rules once.
