Depending on where you’re travelling and your nationality, you'll likely need a valid passport and may also need visas to enter into certain countries - please check this well in advance of your trip departure date. Some countries also require passports to have 3-6 months left on them before the given expiry date.
It is your responsibility as the traveller to make sure you have the appropriate, valid documentation for the length of your trip.
If Contiki requires any specific documentation, we’ll let you know either at the time of booking or before your trip.