TSA rules on liquids: what travelers can and cannot bring

TSA liquid rules at a glance

TSA rules on liquids focus on carry-on baggage and center on the 3-1-1 rule: each travel-sized container must hold 3.4 ounces (100 milliliters) or less, all containers must fit into a single quart-size clear resealable bag, and one bag per passenger is allowed. This applies to liquids, gels, aerosols, creams, and pastes. Items already in checked baggage are generally not limited in quantity per container, though restrictions can apply to hazardous materials. Understanding these basics helps you pack efficiently and reduce delays at security.

3-1-1 rule details and examples

The 3-4 ounce (100 ml) limit per item is designed so that one quart-size bag can hold about four small containers, keeping screening efficient. Containers larger than 3.4 ounces—even if only partially full—are not permitted in carry-on baggage. Travel-sized containers are typically sold in sets that meet this limit. The single quart-size bag must be clear, sealable, and presentable for quick inspection. Place the bag in its own bin during screening to avoid holding up the line. Common examples include travel-size toiletries, small tubes of toothpaste, sample containers, and travel perfume bottles that comply with the size limit.

Real-world carry-on examples

• One 16 oz (473 ml) bottle of shampoo in checked baggage: generally allowed.
• Four 3.4 oz (100 ml) travel containers in one quart clear bag: allowed in carry-on.
• One 6 oz (177 ml) lotion in carry-on: not permitted under the 3-1-1 rule.

Medications and medical exceptions

Medications, including liquids, gels, and creams required for medical conditions, are allowed in carry-on baggage in quantities greater than 3.4 ounces. You do not need to adhere to the 3-1-1 rule for prescription or over-the-counter medicines. However, you should declare these items to the TSA officer at the screening checkpoint. Keep medications in clearly labeled containers when possible, and be prepared to present them for inspection. Coolers, ice packs, and other medical supplies related to your condition are also typically permitted after screening.

Documentation and best practices

• Carry a note or prescription label for prescription liquids.
• Notify TSA officers before screening begins if you have medical items.
• Keep insulin and other temperature-sensitive medications accessible.
• Be prepared for additional screening even with declared medications.

Baby care, food, and household items

Travelers with infants and young children may carry reasonable quantities of liquid baby formula, breast milk, juice, and related baby food in their carry-on. These items are not limited to 3.4 ounces per container, but you should expect additional screening and time at the checkpoint. Outside food and non-medical gels (such as homemade snacks) are generally subject to the standard 3-1-1 limits unless they are medically necessary. Houseplant seeds and certain other agricultural items may also be restricted, so check specific TSA guidance when in doubt.

Practical tips for traveling with baby care items

• Pack baby food and formula in checked bags when possible to speed screening.
• Bring ice packs designed for medical use when needed.
• Notify screening officers that you are traveling with infant care items.
• Be prepared for extra time at the security checkpoint.

Packing efficiently and screening workflow

Smart packing reduces time at security and the chance of having items confiscated. Place your quart-size liquids bag in an easy-to-reach location in your carry-on, and remove it before reaching the TSA checkpoint. Wear slip-on shoes and avoid bulky accessories that require removal. Be aware that wet or leaking containers can lead to additional screening. Following these habits keeps your experience smooth and supports consistent compliance with TSA rules on liquids.

Summary of key limits and exceptions