Ensure all of your liquids or gels are in 3 OUNCE or smaller containers. More than 3 ounces permitted in checked baggage.
Place those containers in a 1 QUART-SIZED, clear plastic, zip-top bag.
Place 1 BAG per traveler in the security bin for screening
The airlines are charging baggage fees between $25-$35 for the first checked baggage and $35-$45 for the second, EACH WAY. The fee increases if the baggage item exceeds the weight limit. It is best to check the rules for the airline you are using for your travel.
TSA Recognized Baggage Locks
TSA screens every passenger's baggage before it is placed on an airplane. While our technology allows us to electronically screen bags, there are times when we need to physically inspect a piece of luggage. TSA has worked with several companies to develop locks that can be opened by security officers using universal "master" keys so that the locks may not have to be cut. These locks are available at airports and travel stores nationwide. The packaging on the locks indicates whether they can be opened by TSA.
TSA's Main Travelers Assistance Page