Good price on a rugged, good quality wheeled back pack and day pack combo. Main pack 44 litres, day pack 16 litres as confirmed with Osprey.
I just received this back pack myself and the day pack attaches with buckles rather than zip, to main pack as stated on page.
I used this for a 3 month RTW trip 10 years ago. While it is a great bag if you need both a backpack and a wheeled bag, I would consider strongly if you really do need both.
My trip was mainly flying/staying in hotels, plus a (hotel) contiki tour and Oktoberfest, and used it as a backpack twice at the most.
IMO get a backpack if you really need it, or get a wheeled suitcase if you don't.
But a great price for the bag if you do need it.