HEYS - RED XCase - Lightest Carry on Luggage 20'' *NEW* Condition: Brand New.  The xcase® - Shiny Finish is the World's Lightest Carry-on weighing a mere 5.1 lbs (2.3 kg) but what makes this feat all the more impressive is its size and interior. The xcase® - Shiny Finish is the maximum allowable carry-on size for most airlines and has a built-in divider with zippered mesh pocket. It's curved single tube handle system prevents you from 'back-kicking' the case, and its exterior has a beautiful glossy painted surface that has a shiny luster much like that of a new car.