I've used a kilt roll a few times - both in a larger luggage and on it's own. Longest trip was UK to NZ over 3 weeks for the Rugby World Cup - only one query about the kilt pin on passing it through the xray machine in Christchurch but one of the other security guys was a kilt wearer and told his colleague it was fine. Haven't had a problem in the past with folding but find the roll useful to keep the kilt separate from everything else (e.g. only in Wellington for one match / one day and no need to unpack everything to get at it) and for longer trips it certainly kept the kilt crease free for when i needed it.