The originals are now selling on Ebay from 40 to 100 dollars or more.
Here is one that is part of a Western Auto Junket to San Juan in the 1960s including the bag and much more.
http://www.ebay.com/itm/VINTAGE-1960-PAN-AM-CANVAS-OVERNIGHT-BAG-TICKET-JACKETS-FLIGHT-MAP-ETC-/200657120558?pt=LH_DefaultDomain_0&hash=item2eb818ad2e
I met a 89 year old man this morning who went on one of these junkets on Pan Am to the Caribbean back in the 1960s when they were introducing jet air travel.
He won the trip in a contest. He said he went to the airport and they flew down to the Caribbean and got off and he went and got drunk and then later they returned to the airport and flew home.
Here is a link to a really good website that is Everything Pan Am.