Set of two child tourist Octopus cards, no deposit required. - Expiry: Valid for 7 years from 2025 - Balance: 1st card HK$11.3, 2nd card HK$9.8 - Last used: May 4, 2025 You can use them immediately on the MTR, etc., after purchase, so why not prepare them before your trip? You can also top them up at MTR add-value machines or at 7-Eleven stores in Hong Kong.