The following things will be useful to have during your trip.
* Copies of your passport and travel documents. Place a copy of your passport and travel documents in each piece of luggage, in case you lose the original documents. Don’t forget to leave a copy with a friend or relative at home.
* Items that might go in your travel health kit.
Check the Transportation Security Administration website for updates on permitted and prohibited items, including medicines that you are allowed to carry onto an airplane.
Some items may not be allowed in other countries. It is a good idea to check the Customs and Import Restrictions section of the U.S. Department of State Tips for Traveling Abroad.
Source: Centers for Disease Control and Prevention