A backpack assembly includes a luggage case having a first attachment interface and a backpack having a second attachment interface. The second attachment interface is configured to be mated with the first attachment interface to removably attach the backpack to the luggage case. The luggage case further...http://www.google.co.uk/patents/US7594569?utm_source=gb-gplus-sharePatent US7594569 - Front pack to front flap multi-backpack conversion system
