Budget airline bag fees are a profit center. Ryanair, Wizz Air, and their ultra-low-cost competitors make millions charging travelers for carry-ons that exceed their famously strict size limits.
But onebagging travelers have discovered something interesting: enforcement varies, and soft-sided bags have wiggle room.
A traveler just tested the Patagonia Black Hole MLC 45L and MLC Micro 22L in a Ryanair sizer at Budapest airport—and both fit. The flight was full, but they had "no issues bringing them on board."
For budget travelers who've paid €50+ in bag fees, this is valuable intel.
The Bag Size Arms Race
Ryanair's official size limit for a free "personal item" is 40cm x 20cm x 25cm—smaller than most daypacks. Anything larger requires paying for "Priority & 2 Cabin Bags" (around €12-30 depending on route) or checking the bag (€25-70).
The Patagonia Black Hole MLC 45L officially measures around 55cm x 35cm x 23cm when fully packed—well over the limit. The MLC Micro 22L is 43cm x 25cm x 15cm—also technically oversized.
Yet both fit in the sizer. How?
Soft-Sided Flexibility
Rigid suitcases and structured backpacks are measured by their frame. If the shell is 56cm, it doesn't matter if you could compress it—it's 56cm.
Soft-sided bags like the Patagonia Black Hole series are different. They're made from flexible, compressible fabric without rigid frames. When lightly packed or squeezed, they can fit into spaces their stated dimensions suggest they shouldn't.
The sizer test proves this: with some strategic compression and positioning, bags that technically exceed limits can physically fit through the measurement frame.
Is This a "Hack" or Just How It Works?
Budget airlines know soft bags compress. The sizer is designed to catch rigid oversized bags and extremely oversized soft bags. If your bag fits through the frame—even with some squeezing—it's within their enforcement threshold.
This isn't sneaking or cheating. It's understanding how the system actually works rather than assuming official measurements are absolute.
That said, enforcement varies: • Some gates are stricter than others • Full flights get more scrutiny • Some staff measure more aggressively • Busy boarding processes may skip checks entirely
The traveler's experience—full flight, no issues—suggests that Budapest to wherever they flew isn't a high-enforcement route. Your mileage may vary.
Other Confirmed Bag Successes
The r/onebag community has been testing budget airline sizers for years. Recent success stories include:
Patagonia Mini MLC on Transavia: Official allowance is 40x30x20cm. The Mini MLC measures 51x30x18cm. It fit.
Various 40L bags on Wizz Air: Multiple travelers report successfully bringing bags that exceed stated limits if they're soft-sided and not overpacked.
The key pattern: Soft-sided, lightly packed bags have wiggle room. Rigid suitcases and overstuffed backpacks don't.
How to Maximize Your Chances
If you want to test the limits without paying bag fees:
Choose soft-sided bags. Fabric backpacks and duffels compress. Hard-shell suitcases don't.
Don't overpack. A bag at 60% capacity compresses much better than one at 100%. Leave space.
Practice compression. Before your trip, practice squeezing your bag into tight spaces. Know where it flexes and where it doesn't.
Distribute weight strategically. Put soft items (clothes) on the outside, hard items (laptop, toiletries) in the middle. This makes the bag more compressible.
Be confident but not arrogant. If questioned, compress the bag and place it in the sizer calmly. Don't argue about measurements—let the sizer decide.
Have a backup plan. Know what you'd remove or check if forced to. Don't make a scene.
Choose less-scrutinized routes. Major tourist routes and peak travel times get stricter enforcement. Off-peak and secondary routes are often more relaxed.
The Budget Travel Calculation
Let's be real: budget airlines make money on fees, not fares.
A London-Barcelona Ryanair flight might cost €15—but by the time you add seat selection (€10), priority boarding (€12), checked bag (€25), and airport check-in (€55 if you forget to do it online), you're paying €117.
If you can fit everything in a compliant personal item, you save €37+. Over multiple flights, that's significant.
That's why the onebagging community obsesses over sizer tests. It's not about cheating the system—it's about not paying artificially inflated fees for carrying reasonable luggage.
Know the Risks
Even if your bag usually fits, you can still get caught: • Gate agents having a bad day • New enforcement policies • Full flights requiring strict compliance • Specific airports or routes with tighter rules
If you're forced to check your bag at the gate, the fees are often higher than if you'd paid in advance. Know the cost before you gamble.
The Bigger Picture
This story is about more than bags. It's about understanding how systems actually work versus how they're presented.
Budget airlines present rigid rules to maximize fee revenue. But the enforcement reality is softer and more flexible—because staff don't have time to measure every bag with a ruler and full flights need to board quickly.
Smart travelers learn to navigate that gap: not breaking rules, but understanding where flexibility exists.
The best travel isn't about the destination—it's about what you learn along the way. Sometimes what you learn is that the right bag, packed the right way, saves you €50 per flight.
And over a summer of European travel, that's a lot of extra gelato.
