They fit so much stuff, and still fit in the overhead compartment
Like George Clooney explains in the critically acclaimed Up in the Air, you know just how important it is to never check a bag (domestically speaking). Personally, I save around, oh, roughly 20 hours each year by not checking bags. But until the Tumi, this was a nightmare—I never had enough stuff with me. The Alpha 2, though, is designed to fit nearly every airline's luggage compartment in the air today, and I still was able to fit a blazer, nine shirts, four pairs of shoes (!), all toiletries, three books, and an odd number of socks.