Your cheap duffel will explode at customs.
Why Not Just Buy the Cheap One?
Rolling suitcases are heavy on cobblestones; cheap backpacks lack support. Osprey's Farpoint has a stowable harness, padded hip belt, and lifetime warranty.
The Buy-Once Math
A $50 backpack shreds seams after one trip. Osprey survives decades and repairs any damage for free. One bag replaces three cheap ones—and your shoulders will feel the difference.