Since 9/11, traveling with liquids has been a sensitive topic. The Transportation Security Administration has established a 3-1-1 Policy for your carry-on liquids, such as shampoo, toothpaste, drinks, perfume, etc. The policy breaks down as follows:

• You are allowed a 3 ounce or smaller container of liquid or gel, such as shampoo, toothpaste, perfume, etc.
• A 1 Quart, clear plastic, zip-top bag can hold as many containers as necessary so long as each container contains no more than 3 ounces of liquid or gel.
• You are limited to 1 bag per traveler.

Of course there are exceptions to the this rule. Breast milk, baby formula, medications, and water are allowed, but must be declared to the security officers for screening. To make the process as smooth as possible, make sure to adhere the the size and quantity limits listed above, and be sure to declare your exempt items at the front of the line. Adhering to these suggestions will make the security checkpoint part of your travel go quickly and as smooth as possible.

Source: Transportation Security Administration