Ryanair's standard cabin bag size is 55 cm x 40 cm x 20 cm. If your bag is 1cm larger in any dimension, you'll be required to check it in at the gate, which costs ?25/?30. So, if possible, make sure your cabin bag adheres to the size restrictions! Hope this answered your question.

Ryanair is notorious for its strict baggage enforcement, and in 2026, even being 1cm over the limit can lead to a significant "Gate Bag" fee. If your bag does not fit completely into the metal sizer at the boarding gate, staff may charge you an on-the-spot fee (often €45 to €70 / £45 to £60) to have it placed in the hold. For soft-sided bags, you can often "squish" that extra centimeter if you haven't overpacked, but for hard-shell suitcases, there is no flexibility. Staff are trained to look for wheels or handles protruding from the sizer. To avoid this in 2026, many frequent flyers suggest using a "frameless" backpack for your personal item, as these are rarely checked if they don't look bulky. If you are caught, arguing rarely works; the "pro-tip" is to wear as many clothes as possible or put heavy items in your pockets to reduce the bag's volume before the final boarding check.