Ryanair Underseat Bag Size: Which Bags Actually Fit Free

What Is Ryanair's Free Underseat Bag Size?

Ryanair allows every passenger one free bag that must measure 40 × 30 × 20 cm and fit under the seat in front of you. That's your entire free allowance unless you've paid for Priority & 2 Cabin Bags or a checked bag. If your bag is larger, it goes in the hold at the gate and you'll be charged £70–£75.

The key word is under. This isn't overhead space—it's the footwell beneath the seat ahead. Ryanair enforces this strictly, especially on busy routes, and they use metal sizers at the gate. If it doesn't slide in cleanly, you pay.

How Ryanair Measures Your Bag

Ryanair measures the bag's external frame—wheels, handles, side pockets and all. The 40×30×20 cm limit includes every protruding part. Soft bags have a slight advantage because they compress, but the airline won't let you force a bag into the sizer. It must drop in without effort.

Most problems occur with bags that are 42 cm tall, have bulky zips, or feature rigid frames. Even a centimetre over the limit can trigger a gate fee. For more on how airlines measure luggage, see Do Wheels Count in Cabin Bag Size?

Bag Types That Fit Ryanair's Free Allowance

Backpacks

Backpacks are the most popular choice for Ryanair's free allowance. A well-designed 40×25×20 cm backpack slips under the seat easily and holds more than you'd expect. Look for models with padded laptop sleeves, exterior bottle pockets, and compression straps.

• Cabin Backpack 40×25×20 — Black — £11.48
• Bordlite Cabin Backpack 40×25×20 — Black — £11.98
• Cabin Backpack 40×25×20 Grey Trim — Blue — £11.35

All three sit well within the limit and have enough volume for a weekend or short week away. Backpacks also distribute weight evenly, which matters when you're walking through the terminal.

Soft Duffel-Style Underseat Bags

Duffel-style bags designed specifically for underseat use often maximise the 40×30×20 cm allowance. They're wider and taller than most backpacks, which means more packing space, but they sit flat under the seat.

• Bordlite Underseat Cabin Bag 40×30×20 — Black & Cream — £11.48
• Bordlite Underseat Cabin Bag 40×30×20 — Yellow — £10.99

These bags work especially well if you're packing bulkier items like shoes or toiletries. The rectangular shape uses every dimension efficiently.

Wheeled Trolleys

Wheeled cabin bags can fit the underseat limit, but the wheels and handle add height. Only buy a trolley explicitly sold as 40×25×20 cm including wheels.

• Cabin Trolley Bag 40×25×20 — Black — £15.99

This model has two wheels and a telescopic handle, so you can roll it through the terminal, then slide it under the seat. It's particularly useful if you have mobility concerns or just prefer not to carry weight on your back.

Comparison: Ryanair vs Other UK Airlines

Ryanair's 40×30×20 cm limit is smaller than easyJet's but identical to Wizz Air's. If you fly multiple carriers, a bag that fits all airlines is a 40×25×20 cm backpack—it's the safest universal size.

What Doesn't Fit (and Why)

55×40×20 cm Cabin Suitcases

These are overhead bags, not underseat. You'll see "Ryanair cabin bag" labels on 55×40×20 cm suitcases, but those only fly free if you've bought Priority & 2 Cabin Bags add-on. Without that, they cost £70–£75 at boarding.

Handbags and Laptop Bags Over 40 cm

Many everyday bags are too tall. A standard 15.6-inch laptop bag often measures 42–45 cm, which breaches the limit. Measure before you travel, or choose a bag sold specifically for airline underseat use.

Rigid Hard-Shell Bags

Hard-shell underseat bags rarely compress, so if they're even a millimetre over, they won't fit the sizer. Stick to soft-shell designs with a bit of give.

Packing Tips for Maximum Space

Even a small bag can hold a surprising amount if you pack smartly. Roll clothes instead of folding them, use packing cubes to compress soft items, and wear your bulkiest shoes and coat on the plane. For a full guide, see Weekend Packing Underseat Bag: 3 Days in One Free Cabin Bag and Maximise Underseat Bag Space: 8 Ways to Fit More Without Paying.

Remember that liquids still follow the 100 ml rule unless your departure airport has upgraded scanners. Check Hand Luggage Liquids Rules UK before you pack toiletries.

How to Avoid the Gate Fee

1. Buy a bag sold as 40×30×20 cm or smaller. Don't guess.
2. Test it in the sizer at the airport before you join the queue, if one is available in the check-in hall.
3. Don't overstuff. A half-empty 40×30×20 cm bag will always pass; a bulging one may be rejected even if the label says it's compliant.
4. Check Ryanair's official baggage page before every trip—rules and fees do change.

For more strategies, read Avoid Airline Baggage Fees: 7 Habits That Keep Costs at Zero.

Choosing the Right Bag for Your Trip

If you're flying Ryanair regularly, invest in a bag designed for 40 × 30 × 20 cm. A backpack suits most travellers because it leaves your hands free and fits under every seat type. A wheeled trolley works if you prefer not to carry weight, and a duffel-style bag is best if you're packing bulkier items or travelling with a child who needs nappies and snacks.

All the bags in our underseat collection are tested against real airline sizers and sold with accurate external dimensions. Pair one with a hanging toiletry bag and a set of TSA-friendly padlocks, and you've got a reliable kit that works on any carrier.

FAQ

Q: Can I take a handbag and an underseat bag on Ryanair?

A: No. Ryanair's free allowance is one bag only, measuring 40 × 30 × 20 cm. That bag can be a handbag, backpack, or small duffel, but you can't bring two unless you've paid for Priority. Your handbag must fit inside your underseat bag or be your only item.

Q: Does Ryanair weigh underseat bags?

A: There's no published weight limit for the free underseat bag, and in practice Ryanair rarely weighs it. The size is the critical measure. However, if your bag is visibly overweight and difficult to lift, gate staff may ask you to check it. For more on weight checks across UK airlines, see Cabin Bag Weight Limits UK Airlines: Who Checks & Who Doesn't.

Q: Can I bring a duty-free bag as well as my underseat bag?

A: Yes. Ryanair allows small duty-free purchases (bought airside after security) in addition to your 40 × 30 × 20 cm bag. However, the duty-free bag must be sealed in a tamper-evident carrier, and some gate staff may ask you to consolidate if it's large. Keep receipts and don't open the bag until you're past all checks.

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.