Went to Birmingham from Knock with Antler cabin case checked with tape size spot on ,checked weight 9KG. Allowed in cabin no problem going. On return charged £20for case owing to design 9document wallet) on front would not fit in to BMI baby's wire cage placed just where you hand in boarding card to enter aircraft. Gave them cash but they held me back waiting for receipt untill I was stressed to breaking point thinking I was going to miss my flight. Would not like any body else to be treated so badly.Be warned about the design of cabin luggage and the very bad way this is checked by airline..Your case needs to be less than allowed measurements to be able to get it through this tunnel wire cage.