Yes, you can keep your Pasmo Passport or standard Pasmo card as a souvenir after your trip to Japan. In 2026, the "Pasmo Passport" (the special version for tourists) is valid for 28 days, after which the electronic chip automatically deactivates and cannot be used for transit again. However, the physical card features a unique Sanrio design (like Hello Kitty) specifically intended for you to keep. Unlike the standard "Green" Pasmo cards of the past, the Passport version does not require a 500-yen deposit, and therefore, you cannot "return" it for a refund. It is important to use up your balance before leaving Japan, as any remaining funds on a Pasmo Passport are non-refundable once the 28-day window expires. If you have an older, "Standard" Pasmo, it remains valid for 10 years from its last use.