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Flying budget airlines like Ryanair, EasyJet, and WizzAir can save you tons of money, but only if you avoid those sneaky baggage fees. The right carry-on backpack fits perfectly under the seat, keeps your stuff organized, and gets you through the gate without extra charges. Whether you’re heading out for a quick weekend trip or a longer adventure, having a backpack that meets strict airline size limits makes travel smoother and your wallet happier.
1. Cabin Max Metz 20L Underseat Cabin Bag (Ryanair Focus)
Built specifically around Ryanair’s classic 40 × 20 × 25 cm free under-seat dimensions, this backpack takes the guesswork out of packing. The Metz 20L opens like a mini suitcase, making it super easy to organize your clothes and gear without digging through a black hole.
Soft sides and compression straps help squeeze it into even the tightest sizers at the gate. At 20 liters, you’ll have enough room for a long weekend if you’re smart about what you bring.
This bag works as a free under-seat option on Ryanair, Wizz Air, and easyJet since it’s smaller than all their limits.
2. Cabin Max Manhattan 20L Backpack – Ryanair Free Size
The Manhattan 20L sticks to Ryanair’s under-seat template but ditches the bulky “budget airline” look for something more polished. Perfect if you’re flying straight into a business meeting or exploring a new city without looking like a tourist.
Its slim profile won’t weigh you down during all-day wear, and the variety of colors means you can pick something that matches your style. Inside, you’ll find a nice balance between organized pockets and open space for flexibility.
Works seamlessly across several carriers, making it a versatile choice for frequent flyers.
3. Xkdoai Underseat Travel Backpack (40 × 20 × 25 cm)
Often priced under £20 during sales, the Xkdoai proves you don’t need to spend big to fly smart. Despite its bargain price tag, this backpack packs in features like a laptop sleeve, toiletry compartments, and compression straps.
The 180-degree opening makes airport packing and security checks incredibly easy—just unzip and lay everything flat. Customer reviews consistently praise its comfort and surprising capacity for a true under-seat size.
Built to 40 × 20 × 25 cm, it works perfectly as a free bag on Ryanair, easyJet, and most budget carriers.
4. Cabin Max Svalbard 24L – Wizz Air 40 × 30 × 20 cm Backpack
Wizz Air flyers, this one’s designed with you in mind. The Svalbard 24L matches Wizz Air’s free hand luggage allowance of 40 × 30 × 20 cm exactly, giving you every last millimeter of space without risking gate fees.
At 24 liters, you’ll notice the extra room compared to smaller 20L Ryanair-style bags—great for longer trips or winter clothes. The organized interior includes a laptop sleeve, small-item pockets, and even a USB pocket option for charging on the go.
Bonus: it also works perfectly on Ryanair’s new dimensions and easyJet too.
5. Cabin Max Manhattan 24L (40 × 30 × 20 cm)
Think of this as the Manhattan 20L’s bigger sibling, scaled up to 40 × 30 × 20 cm for those who need a bit more breathing room. It looks like a regular city daypack, not screaming “airline luggage,” which is perfect for blending in wherever you land.
Inside, you’ll find a laptop compartment and smart pockets that keep your essentials organized without adding bulk. The extra four liters over the 20L version makes a real difference for 2–4 day trips.
Free on Wizz Air and Ryanair, and well within easyJet’s generous limit too.
6. Flymax CabinFlex 40 × 30 × 20 cm – Wizz-Approved Underseat Bag
Looking for an alternative to Cabin Max that’s still built specifically for budget airlines? The Flymax CabinFlex delivers with its clearly labeled Wizz-approved 40 × 30 × 20 cm dimensions and no-nonsense design.
Weighing around just 0.5 kg, this ultra-light backpack means more of your weight allowance goes to your actual stuff, not the bag itself. The 24L capacity includes internal organization and a handy bottle pocket for staying hydrated.
Often discounted and offering solid value, it’s a reliable choice for travelers who prioritize function over flash.
7. Cabin Max 24L Metz Underseat Backpack (40 × 30 × 20 cm)
Loved the classic Metz 20L but wished it had more room? This 24L version keeps everything you liked—clamshell opening, practical pockets, straightforward design—and scales it up to the 40 × 30 × 20 cm sweet spot.
Available through retailers like ASOS, it’s a tried-and-tested design that travelers trust for its simplicity and reliability. The extra space means you can pack for several days without feeling cramped or overstuffed.
Works across Wizz Air, Ryanair, and easyJet as a free under-seat bag, making it a versatile travel companion.
8. Cabin Max 40 × 30 × 20 Range (Memphis / Manhattan / Equator X)
Can’t decide on just one style? Cabin Max’s wider 40 × 30 × 20 cm range lets you choose between sporty, minimalist, or hybrid designs without sacrificing size compliance.
The Memphis, Manhattan variants, and Equator X all hit the important dimension limits for Wizz Air and similar carriers. Some even come in eco-friendly RPET fabric if sustainability matters to you.
Whether you prefer backpacks, holdalls, or something in between, this range offers flexibility for travelers who care about aesthetics as much as functionality.
9. Cabin Max Memphis 30L Backpack (45 × 36 × 20 cm) – EasyJet Max Free Size
EasyJet travelers get the most generous free bag allowance among budget airlines, and the Memphis 30L is engineered to use every bit of that 45 × 36 × 20 cm space. At 30 liters, this feels like a proper carry-on, not just a personal item.
The squared-off design maximizes internal space while keeping the bag easy to wear all day. Multiple color options mean you can express your personality while staying practical.
Ideal for long weekends or even week-long trips if you’re a light packer.
10. Cabin Max Travel Hack 30L Hybrid (45 × 36 × 20 cm)
Created with travel blogger The Travel Hack, this innovative 30L hybrid gives you the best of both worlds—wear it as a backpack or wheel it like a trolley. Designed specifically for easyJet’s 45 × 36 × 20 cm free limit, it’s become a favorite among city-break enthusiasts.
The clever interior layout lets you pack outfits flat, keeping clothes wrinkle-free and organized. It’s practical, stylish, and tested by someone who actually travels constantly.
Perfect for frequent weekenders who want flexibility without sacrificing style or function.
11. Aerolite 45 × 36 × 20 easyJet Cabin Bag
Prefer something more structured than a soft backpack? Aerolite’s 45 × 36 × 20 cm easyJet line includes hard-shell carry-ons and duffel-backpack hybrids that slide easily under the seat while maintaining their shape.
Some versions feature TSA locks, tough ABS shells, or reinforced handles for extra durability. The structured design makes packing easier and protects fragile items better than soft bags.
Because they’re under 55 × 40 × 20, they also work as small overhead cabin bags on many airlines if you upgrade to Priority.
12. Cotopaxi Allpa 35L – Premium Cabin Backpack for Paid Carry-On
Ready to invest in a backpack that’ll last years? The Cotopaxi Allpa 35L consistently ranks among the best travel backpacks for comfort, durability, and organization, even if it costs more upfront.
While it’s not designed for free under-seat limits, it fits standard overhead cabin dimensions (around 55 × 35 × 22 cm), making it perfect as your paid carry-on. The superb harness system keeps you comfortable during long walks and public transport connections.
Ideal if you fly budget airlines sometimes but also tackle longer trips elsewhere.
