Quick answer: Wizz Air gives every passenger one free carry-on that must fit under the seat in front, with a larger trolley bag available on WIZZ Priority and some fare bundles. It is one of the tightest allowances in Europe and the measurements have changed before, so check Wizz Air's own baggage page before you fly and pack to the smaller size.

What this guide covers

Wizz Air runs one of the tightest cabin baggage allowances in Europe, and the exact numbers have changed more than once. Figures copied onto travel blogs tend to outlive the rule they describe.

So the first thing to say is the useful thing: check Wizz Air's own baggage page for the current sizes before you fly. What follows is how to pack to them, which does not change.

The two bags, in principle

Every Wizz Air passenger gets one free carry-on that must fit under the seat in front. That under-seat space, not the weight limit, is what actually stops people boarding with what they planned.

A larger trolley bag for the overhead locker comes with WIZZ Priority and some fare bundles, and can be added to a booking afterwards. Either way, the bag that gets you through the gate is a soft one packed in compression cubes rather than a rigid case that either fits the sizer or does not.

Why Wizz punishes loose packing more than most

A small bag is rarely short of volume. It is short of usable volume. Loose clothing bridges across the corners and leaves air trapped in them, so a bag that looks full is often a third empty at the edges.

That gap matters more on Wizz than on a carrier with a generous allowance, because there is no slack to absorb it. Squaring clothes into a block is the difference between four days of clothes fitting the free bag and needing to pay at the gate.

  • Compress the bulk. Jumpers, hoodies and jeans are where the air is. These are what a compression cube is for.
  • Keep one soft cube. A cube that is not fully stuffed can be squashed into whatever shape is left.
  • Liquids on top. A clear liquids bag at the top of the bag saves unpacking at security.
  • Wear the heaviest layer. Boots and a coat on your body are not in the bag.

Packing so it passes the sizer

The sizer is a box, so pack to a box shape. Load flat cubes in layers rather than dropping things in vertically, and keep the heaviest layer at the bottom so the bag stands square instead of bulging at one end.

If your bag is already at the limit, the fix is almost never folding technique. It is removing one thing. The same logic covers every budget carrier, and our easyJet cabin bag guide and Ryanair 40x20x25 guide cover the same ground for those airlines.

Is the bigger bag worth paying for?

Up to about four nights, the free bag is usually enough with packing cubes doing the work. Past a week, or if you are carrying anything bulky like ski layers or walking boots, paying for the trolley is usually cheaper and calmer than gambling on the gate.

Wizz flies heavily from London Luton, where it shares the terminal with other budget carriers running equally strict rules. If you fly from there often, a set bought once will outlast a lot of gate fees. Our carry-on packing guide goes further into fitting a week into a cabin bag.

The short version

  • Every Wizz Air passenger gets one free carry-on that must fit under the seat in front.
  • The larger trolley bag comes with WIZZ Priority or a fare bundle – check before you fly, the rules have changed before.
  • Under-seat space, not the weight limit, is what actually stops people at the gate.
  • Compress the bulky layers: loose clothing wastes the corners, which a small bag cannot spare.
  • Up to about four nights the free bag is usually enough; past a week, paying for the trolley is the cheaper gamble.

Frequently asked questions

What size is the free Wizz Air cabin bag?

Wizz Air publishes the current dimensions on its own baggage page, and they have changed more than once, so check there rather than trusting a figure copied from a blog. Whatever the number, it has to fit under the seat in front, which is the real constraint.

Will packing cubes help my bag fit the Wizz Air sizer?

Yes, mainly because they square the bag off. A sizer is a box, and a bag packed in flat blocks fills a box shape. Loose clothing bridges across the corners and leaves air in them, so the bag measures bigger than the clothes inside it actually need.

How many days can I pack into the free Wizz Air bag?

Realistically three to four nights for most people, using two small compression cubes, a liquids bag and your in-seat things. A week is possible if you plan to do laundry and wear your bulkiest layer on the plane.

Can I take a backpack as my Wizz Air cabin bag?

Yes, as long as it fits the published size and goes under the seat. A soft backpack is usually a better bet than a hard case, because it will squash into a sizer where a rigid shell either fits or does not.

Is WIZZ Priority worth it for the bigger bag?

For trips past about a week, or anything involving bulky kit like ski layers or walking boots, it usually works out cheaper and less stressful than risking a gate fee. For a short city break, the free bag with compression cubes normally covers it.