The 3-1-1 TSA liquids rule states that you can carry three ounces of liquid in your checked baggage at one time. Most think of the liquids as shampoo and personal items, but you can carry on any liquid if it isn't more than 3.4 ounces per bottle or container in your carry on luggage. Not to mention, as long as you don't have more than one bag with liquids in your bag. In other words, 3.4 ounces one time and only one bag is the 3-1-1 rule.