If, like me, you had the dubious pleasure of flying out of a UK airport over the summer, you will probably have queued at security behind someone embarking on a two-week holiday in the sunshine with all their belongings crammed into one bulging wheelie bag.
No doubt this is driven by a desire to avoid paying easyjet £40 each way to check in a suitcase – and to ensure they still have their luggage when they arrive at