If you’ve tried dragging a suitcase with cheap plastic wheels over the cobblestone streets of Paris, you know why rolling luggage doesn’t work in a city.

Cylinder-shaped packs for "backpackers" aren't much better. Since you pack them from the top, like a garbage bag, they leave your stuff a jumbled mess. They're also too big to be carried onto a plane, so you’re stuck with checked bag fees, the hassle of baggage claim, and the stress of lost luggage.

The Setout travel backpack packs like a suitcase and carries like a backpack.