I keep two KeePass databases with me at all times: my primary database with all of my passwords which I use constantly, and another that only contains scanned PDFs of all of my most important travel documents, including:
- Passport
- Birth Certificate
- Travel Visas (if I have them),
- Health/Travel Insurance info
- A list of vaccinations I've had and when I had them
- Medical Records
- My U.S. Driver's License
In that they are in a KeePass database, they are all stored encrypted while on the USB. Truth be told, no digital copies of those documents will stand up legally in place of hard copies, but sometimes the information on them is all you need and enough to cover you while a hard copy replacement is sent overnight from home.