Osprey's Ozone Convertible 75L/28 is a travelling chameleon. First, it's a large piece of wheeled luggage. But when the pavement ends and your journey continues, deploy the Ozone Convertible's hidden backpack suspension system and carry on. When you reach base camp, zip off the Ozone Convertible's detachable daypack and keep on exploring. At the base of the pack, Osprey's Highroad LT