What is the maximum amount of ounces allowed on a plane?

From toothpaste to deodorant, perfume to hair care, many daily essentials fall under the TSA's definition of liquids. Fortunately, navigating security is straightforward once you know the rules about how many ounces you can take on a plane, the proper way to pack them, and how to present your items for screening.

Your complete guide to TSA's liquid limits for carry-on items

When packing your carry-on, it’s crucial to understand how to properly pack liquids. The TSA 3-1-1 rule is the standard for adhering to liquid limits and is simple to follow. All liquids must be contained in bottles of 3.4 ounces (100 milliliters) or smaller and should fit together in a single clear, zip-top bag that holds no more than one quart (32 ounces). 

Every traveler in your party, including children, can benefit from this allowance. While most liquids you intend to bring are permissible, it's crucial to know what is not permitted in a carry-on bag in any amount.

Toiletries classified as liquids

Keep in mind that the following toiletries are categorized as liquids by the TSA:

• Toothpaste
• Deodorant
• Facial cleanser
• Lip balm
• Aerosol sunscreen
• Fragrance
• Moisturizers
• Nail polish
• Foundation
• Concealer
• Mascara 

Grasping the ounce limits

All liquids, regardless of the product type—including beverages—must adhere to the 3.4-ounce limit per container. These items can be transferred to travel-sized containers, but each must clearly indicate a volume of 3.4 ounces (100 milliliters) or less. This labeling cannot be homemade; it must be part of the original container design. Additionally, TSA liquid regulations encompass gels, pastes, creams, aerosols, and anything not completely solid.

Exceptions and special cases

Like many rules, the TSA ounce limit for carry-on luggage has a few exceptions, though they are rare. In these instances, you'll need to follow extra procedures during the security screening process.

Liquids deemed medically necessary

Medically necessary liquids can be taken in larger amounts. Although there isn’t a strict limit, TSA recommends bringing only what you truly need to avoid extra scrutiny and the risk of confiscation. This category includes prescribed medications, creams, and essential childcare items like baby formula and breast milk.

Unprescribed items, such as regular sunscreen or common lotions, do not fall under this allowance. Be sure to declare and present your medically necessary liquids to a TSA officer during screening. These items may be subject to further noninvasive testing, so it's important to stay polite and cooperative, as the TSA agent has the final authority.

Purchases made at the airport

When you buy liquids, such as beverages or beauty products, after passing through security, you can bring them on your immediate flight without any restrictions. Items sold within the airport have already been screened and won't face additional checks at the gate.

However, if you're arriving in the United States on an international flight and have a connecting flight, you cannot take these purchases in your carry-on for the next leg of your journey. You'll need to either consume, use, or dispose of them unless you have checked luggage. At your first entry point into the US, you must collect all baggage, giving you the opportunity to place these items in your suitcase before proceeding with your onward flight, simplifying the TSA carry-on process.

Purchases made at duty-free shops

Similar to other liquids allowed at airports, duty-free items such as alcohol or beauty products can be taken on your flight without size restrictions according to TSA regulations. These are the only exceptions to the carry-on rules during connecting flights. Duty-free items can exceed the TSA 3-1-1 limit if they were purchased internationally within the last 48 hours, remain in their original, unopened packaging from the store, and are accompanied by the original receipt. Additionally, these items must be presented separately during TSA screenings.

Advice for seamless security checks

Security procedures can vary across airports in the United States, so it's important to stay adaptable and heed the instructions of any TSA agent. Nevertheless, there are essential protocols that are consistently enforced everywhere, with liquid regulations being particularly important.

Reduce your wait time at checkpoints by placing your bag of liquids at the top of your carry-on or in a spot that allows for quick access.

TSA provides a comprehensive guide to screening procedures at their checkpoints, which you should review thoroughly before you start packing. Above all, always follow the instructions of TSA agents and maintain a calm and courteous demeanor.

Carrying full-size liquids on board

While large liquids aren’t allowed in your carry-on, you can still bring food and drinks onto the plane, along with most liquid items. Just make sure to pack them securely in your checked luggage. There are no size restrictions for liquids in a checked bag, but be cautious not to include prohibited items like alcohol over 140 proof, compressed gases, spray paints, or other flammable materials.

Lastly, if you're flying internationally, be sure to check the customs regulations at your destination regarding liquids like alcohol and agricultural items such as honey. Your airline won’t screen these, as there’s no security risk, but you could encounter issues upon arrival during customs checks. If found, these items will be seized, and you might face fines or other penalties.

How this guide was developed

I typically fly twice a week, ranging from quick business trips with just a carry-on to extended journeys with multiple checked bags. In the past, I've had several items confiscated at TSA checkpoints, but now I can breeze through in under three minutes. I've combined my extensive flying experience with Dinogo’s expert insights to create this guide, helping you navigate TSA smoothly and ensuring your checked luggage is compliant.

Time to get moving

Now that you know the ounces you can bring on a plane, it's time to get moving. If you haven't chosen a destination yet, explore popular options using Dinogo’s handy search tools for flights to New York or flights to Los Angeles. If you already have your destination set, Dinogo’s comprehensive flight guide will ensure you have everything covered from planning to arrival.