I flew Kerry to Stansted Airport over the christmas period & I brought a suit folded up in a sports bag...no problem....& by the way is it 10kg and not 5kgs....I recall reweighing my bag in Stansted airport & it weighed 8.9kgs & I had no problem taking it on board.....using the check & go policy of courseWhy not if that is your only piece of hand luggage - under 5kg and within the required dimensions