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Domestic or foreign, only take with you the cards you are likely to use on your trip. Store the rest safely at home or in a safe. In the event of loss or theft, the fewer cards to track the better. Keep every receipt for purchases...cash or credit card. In some countries you may be eligible for a rebate in the form of a "VAT" tax; receipts also protect you against inappropriate charges, insurance valuation, and for proof of purchase at US customs. When endorsing the actual credit card, instead of your signature write "ask for I.D." which will protect you from credit card theft / fraud.