One harness, two packs. The Osprey Men's Ozone Duplex 65L Backpack is a traveler's dream. It combines a casual, carry-on daypack with a larger cargo bag that attach together when you're walking through the terminal, and separate when it's time to check in the cargo bag. This backpack's harness has a male-specific fit with a sturdy LightWire suspension and padded mesh at the shoulders straps, back, and waist. The daypack keeps your essentials safe with a hidden pocket sized for passports, tickets, wallets, phones, and other valuables, while the cargo bag stores clothing and liquids; the liquids pocket is easy to access for TSA.