How Many Ounces Can You Carry On A Plane? (TSA Liquid Fl Oz Rules)

As you are aware, the number of ounces of liquid you can bring on an aircraft is limited.

Before going through TSA security screening, you should be aware of the TSA liquids requirements.

If your bottles exceed the liquids limit, you will be unable to take them and they will be discarded.

The liquids permitted in carry-on luggage are discussed in this topic. Travelers who plan to bring liquids in their checked luggage should read this page.

How many fluid ounces can one bottle hold when flying?

The first element of the TSA’s 3-1-1 rule stipulates that each bottle or container of liquid you bring in your carry-on luggage must be more than 3.4 ounces in size.

If it looks like an odd figure, it’s because 3.4 ounces equals 100 millilitres. This aligns the United States’ aircraft liquids allowance with the rest of the metric world.

Many goods, such as shampoo and shower gel, are available in travel-sized bottles that are less than 3.4 oz.

You may also purchase refillable travel bottles and decant some shampoo from bigger bottles into the smaller bottles.

This may save you a lot of money in the long run, and there’s another advantage to refilling bottles.

3.4 oz is frequently too much fluids for the duration of your journey. A 50 ml bottle of face moisturiser, for example, may last 4 months.

So 3.4 oz of face moisturiser would last 8 months, which is excessive when you’re only going away for a weekend.

Refillable bottles and containers available in a variety of forms and sizes, allowing you to bring enough product to last the duration of your vacation.

All of this is significant since you are not permitted to bring an infinite number of 3.4 oz bottles on an aircraft.

The total number of fl oz you can pack in your carry on is limited by the size of your plastic toiletry bag.

How many ounces of liquid can you bring on a plane?

The second element of the 3-1-1 rule requires that all liquid bottles or containers be put within a quart-sized plastic bag.

A quart contains 32 ounces, yet you won’t be able to fill your plastic quart bag with 32 ounces of liquid. We estimate that a quart bag can hold 7 or 8 travel-sized bottles. So it’s a safe bet that you can bring around 25 total liquid ounces on an aircraft.

The final component of the 3-1-1 regulation specifies that each passenger is only allowed one quart-bag. So you can’t put one quart bag of toiletries in your handbag and another in your carry-on bag.

Liquids That You Didn’t Know Were Liquids

Some liquids, gels, lotions, and pastes are frequently overlooked while packing a toiletry bag.

A liquid is something that can be squeezed, smeared, pumped, spread, sprayed, or spilled. So make sure it’s in your quart bag.

Here is a list of some of the most common offenders:


What Liquids Are Completely Banned?

A few beverages are completely prohibited, even if they are less than 3.4 oz.


These are prohibited for safety reasons. The TSA is attempting to prevent harmful chemicals from being transported on aircraft.

Exceptions in Which You May Bring More Ounces

Liquids aren’t only there to irritate you.

The TSA has no desire to prevent you from flying with vital liquids. At the end of the day, it’s all about safety.

So there are several exceptions to the 3-1-1 rule where you can transport beverages in quantities more than 3.4 oz.

Here are a couple such examples:


  • Baby formula
  • Baby food
  • Breast milk
  • Juice for kids
  • Medicine

If you plan to bring any of these exceptions, remove them from your carry-on luggage at the checkpoint for extra inspection.

Duty-free drinks purchased beyond the security checkpoint might have a pH higher than 3.4.

You may also bring a bottle of water or drink purchased from a store after passing through the security checkpoint.

The Decision

These were the guidelines for packing carry-on bags. Passengers with checked luggage will be permitted to bring more liquids.

However, there are still certain restrictions on travelling with liquids in checked luggage, particularly combustible liquids.


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