My wife and I recently took a trip out of the country and I purchased the Venture 4th Passport Holder Neck Pouch.  My wife bought something else.  In the end, the Venture 4th was the winner.

There are several things that I like about it, but the two biggest are the number of pockets (passport and credit cards here, tickets there, cash there); and the webbing on the back.  I wore it under my shirt and even though it was warm and muggy, the neck pouch didn't bother me (which frankly, surprised me).