So easyjet have rules regarding hand luggage
Cabin bag guarantee
So if its 50 x40 x 20cm easyjet will guarantee it will travel with you in the overhead locker
And if its 56 x 45 x 25cm, but on some busy flights your bag may have to go into the hold.
So how long till Ryanair adopts easyjet idea, about cabin luggage
I think it will go something like this, if your bag is 56 x 45 x 25cm, and you want to take this as cabin luggage, this will cost you £25, if your bag is 50 x40 x 20cm then this wont cost you anything