Another point to remember, is that Easyjet and Ryanair have different size dimensions for their hand luggage which means that the larger one, Easyjet will not fit into the Ryanair carrier! Also, Ryanair measuring cradle is vertical, and Easyjet is horizontal, so the wheels HAVE to fit into it.
Also to be remembered, is the fact that ladies handbags must also be put into the hand luggage, as do laptops. I was watching a man last week trying to fit his large laptop into his bag, otherwise the girl at the desk said he would have to pay £40 extra to carry the bag on the plane. He solved his problem by taking out his duty free goods from his hand luggage, put in his laptop, and carried the carrier bag of bottles onto the plane. This seems really silly, especially bearing in mind that the weight is the same, and - the plane was only one third full.