This is a very important matter of concern. The most crucial document for international travel is a passport that has least 6 months of added validity from the duration of travel. There must be a photo id, citizenship and address proof other than the passport. It is important to carry one or two passport size photos in case of urgent documentation abroad. Next is the visa which is stating the customer’s duration of stay in the respective country he or she is travelling. This is very a vital document that is to be carried and kept safely. It is recommended to make photocopies of it for safety. If one is travelling with kids it is recommended to carry their student ids to avail student discounts at museums and other providing centers in other countries.