The dimensions of my hand baggage are 59cm x 36cm x 19cm. The width and length are OK, but the height is 4 cm too big (it's 59, but should be under 55). I have heard people say that height is the least important since the boxes they use to measure the bags have an open top.
So I'm wondering if I should just buy a new baggage and not risk it, or do you think they won't fine me?