A rugged, light weight travel suitcase.
Worth the price if you wait for it to go on sale (about 1/3rd off a couple times a year).
Previously, I owned the model above this one. The other model had a removable daypack. I didn't like that. It was confusing to pack with the day pack grafted on. Also, that day pack made the center of gravity higher, which made the suitcase easy to tip over while going up curbs and stairs. I think this is a much better suitcase than it's big brother.
Besides the very light weight, my second favorite feature is the cushiony and stable backpack. It helps you carry the weight comfortably.