This wheeled A22 from New York startup Raden is a 56cm x 35cm x 23cm carry-on made to a very high standard from a high-gloss polycarbonate called Makrolon. It has an inbuilt rechargeable battery powering two USB ports to charge your portable devices on the go; proximity sensors to locate it in busy terminals; and a built-in weight sensor to tell you, via the inevitable smartphone app, when it is approaching weight limits. One wonders why you would want a proximity sensor, however, because if a carry-on bag is not close by, you already have a problem. The technology may be more useful for alerting when the larger hold version – the A28 – is on its way down the belt. The scale of the A22 is a great asset, though, as I’ve come across a couple of airlines lately getting quite fussy about the size, not just the weight, of cabin baggage.