I used to have a bit of an obsession with Zero Halliburton luggage. Look familiar? That's because bad guys in all the movies use the briefcases to hold their money and bombs. Over the years I kept buying these things, and usually traveled with a huge 26" suitcase as well as a matching computer case.
I still really like my Zero Halliburton suitcases, but they're somewhat unweildy. Two day trips don't require a hectare of packing real estate.
Plus, there was the allure of the carry-on only passenger. I never really understood how it worked before. How do people carry everything in such small suitcases? Is it really that much more convenient? What's so bad about checking bags? I was curious.