Ryanair is notoriously one of the strictest airlines in the world regarding carry-on baggage. In 2026, every passenger's ticket includes only one "small personal bag" (40 x 30 x 20 cm), which must fit completely under the seat in front of you. If you attempt to bring a standard rolling suitcase without having purchased the "Priority & 2 Cabin Bags" upgrade, you will be stopped at the gate. Gate agents are equipped with "baggage sizers" and are trained to check any bag that looks even slightly oversized. If your bag does not fit into the sizer without being forced, you will be charged a "gate-check fee" of approximately €46 to €70, and your bag will be placed in the hold. Furthermore, they are strict about weight; while the personal bag has no weight limit, the "large" 10kg cabin bag must not exceed its weight limit. The 2026 advice for Ryanair is simple: never "guess" your bag size. Use a soft-sided bag that can compress, and always pre-pay for your luggage online, as "gate fees" are nearly double the price of pre-booked baggage.