Please help me find a suitcase or bag that you have personal experience of getting on to a Ryanair flight as the 10kg priority cabin bag without then making you pay more at the gate.
My 18 year old is traveling alone and despite having a rucksack of the correct dimensions I have visions of him over stuffing it and falling fowl or the sometimes overzealous Ryanair staff at the gate.
So ideally something that holds it shape and can't be outside the dimensions whatever DS does to it.