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2 Passports is part of the TPOL in Shanghai Trip Report.
How a paper book is still the way to get in and out of countries is a topic for another day. Since my passport is my pass to move about the world, losing it is my worst nightmare. Complicating matters is how I have to travel with two passports when going to China. My multiple entry, 10-year Chinese visa is in my old passport but is still valid when accompanied with my current passport.
Each time I checked in and out of a hotel, I had to explain that my visa was in my second passport after watching the person fumble around my current passport for the document and say to me that I need a valid visa to check-in. The thought of losing my passport keeps me up at night. The thought of being detained in China for losing the second brings back terrible memories when I botched the China 144-hour Visa-Free Transit (It Worked the 1st Time, China 72-hour Visa-Free Transit Disaster (again), and China 72-hour Visa-Free Transit Disaster (again)).
TPOL’s TIP: Don’t bother with the visa-free transit option. Get a 10 year visa.
At least the Chinese visa remains valid. My Russian three-year visa was voided or would cost almost as much to move to my new passport as it would to get a brand new one.