What size is a Jetstar carry-on bag?

The main item can be up to 56 x 36 x 23 cm (about 22 x 14 x 9 in). From February 2, 2027, the same size applies to the overhead bag you get with Priority Carry-on or the new Flex bundle.

Is Jetstar's carry-on limit still 7 kg?

Yes, until February 2, 2027: 7 kg across 2 items, and no bag over 10 kg. From that date, on Jetstar Airways flights, there's no 7 kg limit, and the 10 kg cap per bag stays. Jetstar Japan keeps the 7 kg rule.

What is changing with Jetstar carry-on in February 2027?

On Jetstar Airways flights from February 2, 2027, every booking includes one underseat bag up to 40 x 30 x 20 cm. An overhead bag needs Priority Carry-on or the new Flex bundle.

How much is Priority Carry-on on Jetstar?

It's priced per flight, and you'll see the price when you book. Jetstar hasn't published a 2027 gate price yet.

I booked before August 5, 2026 for a flight after February 2, 2027. Do I get an overhead bag?

Yes. Jetstar includes Priority Carry-on on those bookings, whatever your fare or bundle, except group bookings.

Does Jetstar Japan have the same carry-on rules?

No. Jetstar Japan flights keep 2 items and 7 kg after February 2, 2027.

What happens at the gate if my carry-on is over the limit?

Today you can buy the extra 7 kg option at the gate (85 Australian dollars on domestic flights) if it's available. Otherwise the bag goes in the hold for 125 Australian dollars on domestic flights. From February 2, 2027, you can upgrade to Priority Carry-on if it's available; if not, the bag may need to be checked and extra fees apply.

Jetstar

Jetstar Carry-On Size

Until February 2, 2027, every Jetstar fare includes an overhead bag. From that date, on Jetstar Airways flights, it doesn't: the included bag is an underseat bag, and the overhead bag becomes an extra. Here are both sets of rules, in centimetres as Jetstar publishes them and in inches converted by us.

Quick answer

Now: 2 items with a combined weight of 7 kg. The main item must fit in the overhead locker and be no bigger than 56 x 36 x 23 cm (about 22 x 14 x 9 in, converted). The second item must fit under the seat.
From February 2, 2027, on Jetstar Airways flights: an underseat bag up to 40 x 30 x 20 cm is included. An overhead bag up to 56 x 36 x 23 cm comes with Priority Carry-on or the new Flex bundle.
Weight after the change: the 7 kg combined limit goes, and the 10 kg cap per bag stays.
Jetstar Japan flights keep today's rules.

Verified November 13, 2026 against jetstar.com

Official sources: carry-on rules now · carry-on rules from Feb 2, 2027 · what you can bring on board. How we check: how we verify fees.

Jetstar cabin bag sizes

Swipe for more

Bag	Size as published	Inches (converted)	Weight	Included on a Starter fare?
Main item, now	56 x 36 x 23 cm	about 22 x 14 x 9	7 kg shared with your small item; no bag over 10 kg	Yes
Overhead bag, from February 2, 2027	56 x 36 x 23 cm	about 22 x 14 x 9	Up to 10 kg	No: Priority Carry-on or the new Flex bundle
Underseat bag, from February 2, 2027	40 x 30 x 20 cm	about 16 x 12 x 8	Up to 10 kg	Yes
Garment bag	114 x 60 x 11 cm	about 45 x 24 x 4	No weight published	Can replace your main item now; from February 2, 2027 it can replace the overhead bag only if you have Priority Carry-on

The overhead bag size stays the same. What changes is whether your fare includes it.

Which rules apply to your flight

The new rules follow your travel date: Jetstar Airways flights departing from February 2, 2027. They don't apply to Jetstar Japan flights or to group bookings of 10 or more passengers. If your trip goes out before February 2, 2027 and comes back after it, each direction has its own allowance.

Booked before August 5, 2026? For flights from February 2, 2027, Jetstar includes Priority Carry-on whatever your fare or bundle, except on group bookings. If you paid for the extra 7 kg carry-on option, Jetstar says it will refund that too. Check Manage booking to see your allowance.

Need more than 7 kg today?

The Extra Carry-On Baggage option (7 kg more) takes you to 14 kg across 2 items, with the main item up to 10 kg. It's on selected routes only and subject to availability, and it isn't sold on flights between Australia and New Zealand.

Swipe for more

Extra 7 kg bought	Australian domestic	International Jetstar Airways
At airport check-in	60 Australian dollars	85 Australian dollars or 60 US dollars
At the boarding gate	85 Australian dollars	110 Australian dollars or 100 US dollars

If the extra 7 kg option is sold out, or your bag is over 10 kg, your total is over 14 kg, or the bag is too big, it goes in the hold at the gate: 125 Australian dollars on domestic flights, or 175 Australian dollars (115 US dollars) on international flights.

Priority Carry-on from February 2, 2027

Priority Carry-on adds the overhead bag to the included underseat bag. Its price depends on the flight and shows when you book. At the gate, you can upgrade to Priority Carry-on if it's available. If it isn't, or a bag is over the size or item limit, the bag may need to be checked and extra fees apply. Jetstar hasn't published its 2027 gate fees yet; it says it will update them before February 2, 2027.

The new Flex bundle, on sale from August 5, 2026, lets you choose Priority Carry-on or 20 kg of checked baggage. If Priority Carry-on is sold out, only the 20 kg option is offered. For every bundle, see Jetstar baggage allowance.

Business Class

Business includes 2 items with a combined 14 kg today. From February 2, 2027 it includes an underseat bag (40 x 30 x 20 cm) and an overhead bag (56 x 36 x 23 cm). Business travelers can also bring a garment bag on top of their carry-on allowance.

Duty free

Now, your small item can include duty-free goods. From February 2, 2027, you can bring one small duty-free bag on board on top of your carry-on allowance, with proof of purchase.

How to make sure your bag fits

Measure the bag packed, including wheels, handles and outside pockets. Soft bags grow when they're full.
While the 7 kg rule applies, weigh both cabin items together.
From February 2, 2027, weigh each bag on its own. The 10 kg cap per bag already applies today and stays. Jetstar says it will no longer routinely use cabin bag scales but asks you to keep each bag to 10 kg.
A tape measure and a box will tell you more than the label on the bag: try our bag sizer home test.

Gotchas

A bag that's fine today can cost extra after February 2, 2027. Same bag, same size, but on Jetstar Airways flights it needs Priority Carry-on.
The shared 7 kg limit goes. Today two items share 7 kg, and no bag can be over 10 kg. After the change there's no shared limit, but the 10 kg cap per bag stays.
Connecting between Jetstar Airways and Jetstar Japan: each leg follows its own carry-on rules, so pack for the smaller allowance.
Sorting it at the gate costs the most. Today the extra 7 kg option is 60 Australian dollars at domestic check-in and 85 at the gate.

FAQ

What size is a Jetstar carry-on bag?: The main item can be up to 56 x 36 x 23 cm (about 22 x 14 x 9 in). From February 2, 2027, the same size applies to the overhead bag you get with Priority Carry-on or the new Flex bundle.
Is Jetstar's carry-on limit still 7 kg?: Yes, until February 2, 2027: 7 kg across 2 items, and no bag over 10 kg. From that date, on Jetstar Airways flights, there's no 7 kg limit, and the 10 kg cap per bag stays. Jetstar Japan keeps the 7 kg rule.
What is changing with Jetstar carry-on in February 2027?: On Jetstar Airways flights from February 2, 2027, every booking includes one underseat bag up to 40 x 30 x 20 cm. An overhead bag needs Priority Carry-on or the new Flex bundle.
How much is Priority Carry-on on Jetstar?: It's priced per flight, and you'll see the price when you book. Jetstar hasn't published a 2027 gate price yet.
I booked before August 5, 2026 for a flight after February 2, 2027. Do I get an overhead bag?: Yes. Jetstar includes Priority Carry-on on those bookings, whatever your fare or bundle, except group bookings.
Does Jetstar Japan have the same carry-on rules?: No. Jetstar Japan flights keep 2 items and 7 kg after February 2, 2027.
What happens at the gate if my carry-on is over the limit?: Today you can buy the extra 7 kg option at the gate (85 Australian dollars on domestic flights) if it's available. Otherwise the bag goes in the hold for 125 Australian dollars on domestic flights. From February 2, 2027, you can upgrade to Priority Carry-on if it's available; if not, the bag may need to be checked and extra fees apply.

Jetstar pages: Jetstar baggage allowance · Jetstar personal item Compare: Carry-on size by airline · Personal item size by airline Guides: Personal item or carry-on: the difference · Bags that fit strict airlines · Will my bag fit the sizer?

Disclaimer

Bag rules change. Confirm size, fee, and fare rules on the Jetstar site before you travel. BagRule is a publisher site and does not sell tickets or bags.