Bag That Fits All Airlines: One Size for Ryanair, easyJet & Wizz

The One Bag Dimension That Works Everywhere

If you want a bag that fits all airlines without paying extra, choose 40 × 30 × 20 cm. That under-seat dimension satisfies the free allowance on Ryanair, easyJet and Wizz Air—the three budget carriers most UK travellers fly—and works equally well on Jet2, TUI, British Airways and the European full-service bunch. You'll never pay a gate fee, you'll board in any group, and you'll skip the scrum at baggage reclaim.

The logic is simple: every airline permits a personal item that slides beneath the seat in front of you. The smallest common denominator across Ryanair, easyJet and Wizz Air is 40 × 30 × 20 cm, so anything within that envelope clears every sizer frame. Our airline cabin bag size comparison shows why this dimension beats all others for multi-carrier flexibility.

Why 40×25×20 cm Is the Sweet Spot

Ryanair's 40 × 30 × 20 cm sets the floor. easyJet's slightly larger 45 × 36 × 20 cm and heavier 15 kg allowance offer more room, but a bag built to Ryanair's spec will always fit easyJet. Wizz Air's 40 × 30 × 20 cm and 10 kg limit match Ryanair exactly, so one bag genuinely covers all three.

Jet2, TUI, British Airways, Lufthansa and the rest accept the same 40 cm length and similar widths, meaning your single under-seat bag boards free every time. Read our guide on personal item vs cabin bag to understand exactly why airlines separate the two.

The Bag2Travel Picks That Work on Every Carrier

We stock several bags in the universal 40×25×20 cm footprint:

• Cabin Backpack 40×25×20 (0.5 kg) – Black (£11.48)
  Lightweight, one main compartment, laptop sleeve. Perfect for weekend trips.

• Bordlite Underseat Cabin Bag 40×25×20 – Black (£10.48)
  Soft-sided duffel style, easy to compress. Ideal if you pack light and want flexibility.

• Underseat Cabin Bag 40×25×20 – Grey (£10.48)
  Clean design, front pocket for travel documents, fits neatly under every seat.

All three comfortably hold three days of clothes, toiletries (in a compliant liquids bag) and electronics. For longer trips, roll your clothes tightly and use packing cubes—our article on one week cabin luggage only shows exactly how to stretch a small bag across seven days.

When a Slightly Larger Bag Still Works

easyJet's 45 × 36 × 20 cm allowance means a 40×30×20 cm bag—Ryanair's old overhead dimension—also flies free as your easyJet under-seat item. If you split your travel between easyJet and Jet2 or TUI (both of which include free overhead bags anyway), the Bordlite Underseat Cabin Bag 40×30×20 – Black & Cream (£11.48) or the Bordlite Underseat Cabin Bag 40×30×20 – Yellow (£11.98) give you an extra 5 cm of depth without breaking easyJet rules.

But the moment you add a Ryanair or Wizz Air flight to your calendar, the 40×25×20 cm dimension is the only one that guarantees zero hassle. Our easyJet small cabin bag guide explains easyJet's unique allowance in detail.

Overhead Bags: Why Universal Doesn't Exist

No single overhead cabin-bag dimension works free across all UK carriers. Ryanair and Wizz Air both require paid Priority for 55 × 40 × 20 cm bags, while easyJet charges separately unless you hold easyJet Plus membership or buy a FLEXI fare. Jet2, TUI and British Airways include a free overhead bag for everyone, but their dimensions vary slightly:

• Jet2 and TUI: 56 × 45 × 25 cm
• British Airways: 56 × 45 × 25 cm
• easyJet: 56 × 45 × 25 cm

If you fly a mix of budget and full-service airlines and want to use the overhead locker, you'll need either separate bags or a willingness to pay add-ons selectively. The smartest move for true multi-airline simplicity is to maximise your underseat bag space and skip the overhead lottery altogether.

Practical Packing for a 40×25×20 cm Bag

• Roll, don't fold. Rolled garments pack tighter and wrinkle less.
• Wear your bulkiest items. Trainers, jeans and a jacket on your body save half the bag.
• Decant toiletries. Transfer shampoo and sun cream into 100 ml travel bottles, then group them in a clear resealable bag. Check the latest hand luggage liquids rules before you pack.
• One pair of shoes inside. Flip-flops or ballet flats sit flat at the bottom; stuff socks inside them.
• Electronics in a sleeve. Laptop, tablet and charger in one padded compartment keeps everything safe and easy to remove at security.

Our weekend packing guide walks through a real three-day wardrobe that fits a 40×25×20 cm bag with room to spare. Add a fast-charge power bank (£28.48) if your phone drains quickly—just remember the power bank hand luggage rules limit capacity to 100 Wh in the cabin.

What Happens at the Gate

Airlines measure bags in two places: at check-in and at the gate. A 40×25×20 cm bag will pass every sizer frame, but overstuffing can push the sides beyond the template. If the gate agent thinks your bag looks too large, they'll ask you to prove it fits the frame. Ryanair's team are particularly vigilant—our guide to the Ryanair bag sizer explains exactly how the measurement works and how to avoid a £70–£75 charge.

easyJet and Wizz Air use similar frames. Pack to the true dimension, don't force zips, and you'll board without a second glance.

The One-Bag Strategy for Multi-City Trips

If your itinerary mixes Ryanair, easyJet, Wizz Air and a full-service return on British Airways or Lufthansa, a single 40×25×20 cm under-seat bag covers every leg without paying a penny in baggage fees. You'll board first (or at least early), stow your bag at your feet, and walk straight off the aircraft while everyone else waits at the carousel.

For a fortnight away, layer a second bag on the British Airways or Jet2 legs where overhead is free, then check it into hold on the budget return flight. That way you maximise your free allowance on each carrier without buying Ryanair Priority or easyJet's up-front add-on. Our Ryanair baggage fees breakdown shows exactly when it makes sense to pay and when it doesn't.

Browse our full range of under-seat cabin bags to find the style that suits your trip, and read our cabin bag weight limits guide if you're curious which airlines actually weigh hand luggage at the gate.

FAQ

Q: Will a 40×25×20 cm bag really fit all UK airlines?
A: Yes. Every major UK carrier—Ryanair, easyJet, Wizz Air, Jet2, TUI, British Airways, and the European full-service group—accepts a personal item of 40 × 30 × 20 cm or larger. A bag built to that dimension will always board free as your under-seat item.

Q: Can I use a 40×30×20 cm bag on Ryanair?
A: Not as a free personal item. Ryanair's under-seat allowance is 40 × 30 × 20 cm, so a 40×30×20 cm bag is 5 cm too wide. You'd need to buy Priority & 2 Cabin Bags to carry it in the overhead locker, or risk a £70–£75 gate fee if it doesn't fit the frame.

Q: Which is better for multiple airlines—a backpack or a duffel?
A: Both work, as long as the dimensions are correct. Backpacks like the Cabin Backpack 40×25×20 leave your hands free and distribute weight evenly. Soft duffels like the Bordlite Underseat Cabin Bag compress more easily if you're packing light. Choose the style that suits how you travel.

Q: Do I need to weigh my under-seat bag?
A: Rarely. Ryanair doesn't publish a weight limit for the free personal item; easyJet allows up to 15 kg; Wizz Air sets 10 kg. In practice, gate staff focus on dimensions, not weight, for under-seat bags—but don't pack it so heavy you can't lift it into the overhead locker if asked.

Airline baggage rules and fees change frequently and can vary by route, travel date and when you book. Always check the airline's current official baggage policy before travelling.

Also worth reading: Do Wheels Count in Cabin Bag Size? How Airlines Measure Luggage