In addition to the essential records (credit cards, passport, drivers license, insurance, etc), backed up computer data (which includes archived photo collection backed up to DVD's), spare cash, clothing, my 60 GB IPOD Photo (filled with my entire music collection), Tyros Keyboard, I'd make sure not forget my "MusicPad Pro+" , which nearly includes my entire music fakebook library. I'd expect (except for the Tyros) could be carried on my back. - Scott