What is the 3-1-1 rule?
The 3-1-1 rule limits the amount of liquid you can bring on board a plane.  You may use containers no larger than 3.4 ounces, place in a 1 quart, transparent, plastic, sealable bag, limited to 1 bag of liquids per passenger. If you attempt to bring a container of liquid larger than 3.4 ounces, the TSA will likely confiscate it, holding up the line in the process. 

Any liquid, aerosol, gel, cream or paste could require additional screening. Foods such as peanut butter, pudding, mashed potatoes and icing are all classified as gels. Mascara and lip gloss are also classified as liquids or gels.

Prescription medication is exempt as are infant and child nourishments such as formula, breast milk and juice. These items should be separated from other liquids when going through TSA screening.

Following the TSA's 3-1-1 rule for traveling with liquids will help make your TSA screening a much smoother process.