Traveling on a plane has certain rules that passengers need to follow. One of the rules is that passengers can only carry a limited amount of liquid measured in ounces. Before you are ready to board your flight, it is important to understand the maximum amount of ounces you are allowed to bring on the plane. This knowledge will help you avoid any extra security checks. The TSA 3-1-1 rule limits the amount of liquids, creams, gels, and pastes you can bring in your carry-on bag. In addition to the limit on liquids, there are specific items that you cannot bring on the plane. Please gather all the necessary information about these rules to ensure a smooth and hassle-free security check without any unexpected issues.

Liquid Items

According to the TSA rule, you can only bring liquid items in containers. You can only bring items that are approved by airlines. You need to put all the containers you want to bring in a 1-quart bag. Each passenger is permitted to carry only one bag.  Based on what was mentioned earlier, the items that fall under the TSA 3-1-1 rule are:
  • Mouthwash 
  • Lotion 
  • Toothpaste 
  • Shampoo and conditioner 
  • Gel 
  • Nail polish 
  • Eye drops 

Airlines Have Given Their Approval to Exceptional Liquids

There are times when you may need to carry certain items for health and safety purposes. The TSA has made some changes to the liquids allowed in carry-on bags in certain situations. 

3-1-1 Rule Are

  • Baby care items 
  • Breast milk
  • Baby formula 
  • Prescribed medication 
  • Frozen items
  • Hand sanitizer
It’s important to remember that the usual limit for carrying hand sanitizers is 3.4 ounces. However, the limit can be increased depending on the situation with the coronavirus pandemic.

Prohibited Fluids

The TSA has rules about what liquids you can bring on a plane to keep everyone safe. Even if you follow the 3-1-1 rule, there are still some items that may not be allowed according to the guidelines. The TSA restricts any hazardous fluids from being carried on a plane for the safety of both the staff and passengers.  There Are a Few Items That You Are Not Allowed to Carry:
  • Products used for personal protection, such as pepper spray.
  • Sharp objects such as scissors with blades longer than 4 inches, razor blades, and box cutters.
  • Items that can explode or start fires
  • Liquid items such as insecticides, spray paint, and laundry starch that are used for things other than personal hygiene. 
  • Check Out TSA Official Website.

On a Plane, How Many Fluid Ounces Are Allowed?

According to the TSA 3-1-1 guideline, each passenger can bring liquids in a container that is no larger than 3.4 ounces or 100 milliliters. The bag made of quartz that holds the liquid items needs to be screened separately at the security checkpoint. This rule mostly applies to the bag that passengers want to bring with them on the plane as carry-on luggage. 

Here is a List of the Amount of Liquid Ounces You Can Bring on a Domestic Plane:

When you are traveling within your own country, make sure to pack any liquids you want to bring in containers. You should not have more than 3.4 ounces or 100 milliliters of these.  Separate all liquids, gels, and aerosols like toothpaste, lotions, and cough syrup. Also, keep consumables like water, soda, and peanut butter in a separate place. To ensure a smooth screening process, you can place each item in a separate bag made of clear quartz. If you bring liquid items through the x-ray, there is a possibility that the TSA agent may need to do extra checks. 

How Many Ounces Can You Bring Internationally on a Plane?

The TSA’s overall carry-on policy is unchanged for overseas flights. In other words, each passenger is only allowed to bring one clear quartz bag that contains no more than 100 milliliters of liquid.  When they include duty-free items purchased abroad and you are flying to the United States and have a connecting flight, you are permitted to bring liquids that are larger than 3.4 ounces. A receipt for the purchase of certain duty-free items must be provided within 48 hours.

What is the Maximum Amount of Ounces Allowed on a Plane?

Passengers are allowed to bring liquid items like toiletries and medicine in separate containers. You should not have more than 100 milliliters of each item. You can bring as many containers as you want on the plane, but all the items should fit into one quart-sized bag per passenger. 

How Many Ounces as Carry-on can You Take on a Plane?

The bag that a traveler brings onto the plane with them is called a cabin or carry-on bag. The 3-1-1 rule mainly applies to this kind of baggage. So, this is called the TSA carry-on rule.  Please remember that you can only bring containers of 100 milliliters or less in your carry-on bag. You can have as many containers as you want. This means that all the items must be packed in a single bag that is one quart in size and transparent. 

Glass Ounces In Plane

Passengers can bring glass items on a plane. In order to bring liquid in a glass container in your carry-on bag, the amount of liquid must be less than 100 ml. You can bring as many glass bottles as you want in your checked baggage, as long as they don’t exceed the weight limit. You are allowed to bring alcohol in glass bottles with a volume of up to 5 liters, as long as the alcohol content is below 70% ABV. While you are doing that, please make sure to wrap the glass items carefully in a cloth. You can put them in between the luggage to make sure they don’t break.

Extra Ounces

Usually, if you have more liquid than the allowed amount, a TSA agent might take it away. You can bring liquids in bottles that are 3.4 ounces or smaller, and you need to pack them all in a 1-quart bag. However, there are some things that you can bring on an airplane in your carry-on bag, even though they might not usually be allowed. These exceptions include medications and items for taking care of babies.  If you are traveling with a baby, it can be easier to bring certain fluids like baby food, breast milk, baby formula, disinfecting wipes, etc. This is a valid exception to the 3-1-1 rule, even though it may be seen as a loophole.


In summary, when traveling by plane, be mindful of the TSA’s 3-1-1 rule, which limits liquid containers in your carry-on to 3.4 ounces or 100 milliliters, stored in a quart-sized bag. Exceptions include essential items like baby care products and prescribed medications. Prohibited hazardous liquids ensure safety. These rules apply domestically and mostly for carry-ons, while larger quantities can go in checked bags.

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