Yes, Ryanair is extremely strict about checking bag sizes at the gate in 2026. If you have not purchased "Priority & 2 Cabin Bags," you are only allowed one small personal item (40x20x25cm) that must fit under the seat. In 2026, gate agents frequently use metal sizers to test bags; if your bag does not fit or if you bring a second bag without a permit, you will be charged a "Gate Bag Fee," which currently ranges from €45 to €70. The bag will then be tagged and placed in the aircraft hold. Furthermore, if the overhead lockers become full on a busy flight, even those with Priority status may have their larger 10kg bags checked into the hold at the gate (though usually for free in this specific instance). In 2026, it is highly recommended to pre-pay for luggage online, as gate fees are significantly higher than booking through the Ryanair app.