Can you take liquids with you while traveling ? we all have questions about how many fl ounces can you take on a plane while traveling by airplane You can use the 3 -1-1 rule from the Transportation Security Administration to keep a record of what you're allowed to bring on an aircraft in your carry-on luggage. 3 - Liquids, gels, and lotions must be packaged in containers containing no more than 3.4 ounces (100 ml) (by volume). 1 - Everything you have should fit inside a 1-quart clear plastic bag with a zip-top closure.