As of January, 15th 2018 Ryanair hand baggage policy has changed. Now you can bring on board one small bag and a trolley only if you purchase Priority & 2 Cabin Bags. In this case you can bring a small bag to be put under the seat in front of you; this bag must be 35 x 20 x 20 cm in size. With Priority & 2 Cabin Bags you can take also a 10 kg trolley on board, which cannot be bigger than 55 x 40 x 20 cm.
If you haven’t purchased Priority & 2 Cabin Bags, you can only bring a small bag (35 x 20 x 20 cm) on board and your trolley (10kg, 55x40x20 cm maximum size) will be put into the hold for free.
You can also add a hold baggage to your reservation online or at the airport: you can bring a 20 kg luggage starting from € 25.