Question:
I'm looking for some recommendations on a case that can hold a
passport, airline tickets, and maybe a credit card?
Answer:
I recommend the free, plastic travel folder given by most travel agents with
one's tickets, or the ones you can buy in travel shops. Why the question?
I just keep my airline tickets, passport, and credit cards in a neck
pouch which I wear under my shirt when I travel. Any store with
a decent selection of luggage will sell neck pouches. They are very
inexpensive; something like $10.00.
If what you are looking for is something which can be concealed I think that you
are out of luck. As far as I have been able to discover all of the currently
available neck, shoulder, or waist pouches are at most 7 inches and will not
take a standard air ticket even is separated.
Try having an extra pocket put into your jacket.