I also found it MUCH easer to use my drivers licenses as photo id to board the ship... just because it fits nicely in the waterproof pouches...where a passport would not. While going to the beaches and such at the ports who wants to tote along a purse or wallet that's not waterproof ??..one of the waterproof container that hang around your neck...work wonderfully...their just big enough to fit the KTTW card, a DL, credit card and a little cash for a taxi or such....of course you could always get the XL ones to fit your passport...but myself i'd rather loose my DL than a passport.