Can I bring liquids on a plane? has been the most frequently asked question in the previous ten years or how many ounces can you take on a plane in air transport. The response is “Yes,” however… You are allowed to bring a quart-sized bag of liquids on a plane, according to the TSA’s official website. Each liquid container should hold exactly 3.4 ounces (100 ml) of liquid, or less. There are some items that are allowed through the TSA security checkpoints if you have something odd you picked up as a gift for someone during your business trip or want to bring a small amount of food with you on the plane.