The Sea to Summit Meridian 40L Duffle switches between hand carry and backpack mode with a quick-change harness, so a bag built for checked baggage doesn't turn into a struggle the moment it needs to be carried on foot. A reinforced base and corners, all-metal hardware, and robust YKK zips stand up to the kind of rough handling checked bags actually get, so durability doesn't depend on gentle treatment. What Our Gearhead(R) Experts Are Saying:"I pulled this off the baggage carousel and had the straps out and worn like a backpack before I even reached the exit, no fumbling with buckles or wondering if it'd hold together. That's the difference between a real convertible bag and one that just claims to be."