With more airlines charging for checking bags into the hold, flying with hand luggage only has never been a better idea. The only problem is that most bags that fit the airlines' strict maximum dimensions (55x40x20cms) tend to be heavy, hard-sided roller cases, which take up a big chunk of your weight allowance before you put anything in them. Step forward the Flylite bag, a soft bag which is exactly the right dimensions, weighs under 1kg, and can fold up into a slim A4-sized wallet. It costs £20 from www.flylite.uk.com.