Sounds like a pack of gum, eh? Well that is the size limit United Airlines is imposing of passengers who try to board the plane with those huge suitcases for the overhead bins.
As people scramble to be first to board, they can claim the best storage leaving those in Groups 5, 6 and 29 without a place to store the kitchen sink.
Promoted as an effort to quicken loading and ensure space is available for all, it is certainly something that all airlines will likely embrace.
I just hope I don't get a bulkhead seat!