What kind of luggage you carried used to be a simple choice of personal style and durability, but in the post 9/11 world things are different. Regulations for air travel are not only much stricter than they used to be, but they're also changing all the time. Having a set of luggage that you both love and can use/is in compliance for more than one trip is a valuable thing these days!
But thankfully the luggage market is stepping up the the challenge, especially the brands with upscale globe-trotting clientele bases. They're coming out with bags that are lighter than ever, tougher than ever, and of course, more stylish than ever. Many companies are even providing carry-on essentials like ziplock plastic bags and appropriately sized plastic bottles. And that's helpful, seriously.