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LiquidsUpdated 2026-06-30

TSA 3-1-1 Liquids Rule: The Ultimate Packing Guide

Learn how to pack liquids, gels, and aerosols for your flight under the official TSA 3-1-1 guidelines.

The Transportation Security Administration (TSA) enforces strict limits on liquids, gels, and aerosols in carry-on baggage. This policy is commonly referred to as the 3-1-1 liquids rule.

Understanding how to pack these items before you arrive at the airport checkpoint will save you time and prevent security officers from confiscating your personal care items.

What is the 3-1-1 Liquids Rule?

The numbers 3-1-1 represent the exact packing requirements you must follow:

  • 3: Liquid containers must be 3.4 ounces (100 milliliters) or less per item. Larger containers, even if only partially filled, are not allowed through security.
  • 1: All liquid containers must fit inside one clear, quart-sized plastic bag. The bag must be resealable (zip-top).
  • 1: Each passenger is allowed only one plastic bag in their carry-on luggage.

[!IMPORTANT] Any liquid container larger than 3.4 ounces must be packed in your checked baggage, regardless of the amount of liquid inside.

Exemptions to the 3-1-1 Rule

TSA allows certain liquid exemptions that do not need to fit inside the quart-sized bag. However, you must declare them to security officers at the checkpoint for manual screening:

  1. Baby Formula and Breast Milk: Allowed in reasonable quantities exceeding 3.4 oz. This also applies to baby food and puree pouches.
  2. Prescription Liquid Medicines: Essential liquid medications, syringes, and inhalers are exempt.
  3. Duty-Free Liquids: Liquids bought at duty-free shops in secure, tamper-evident bags are allowed if they meet documentation checks.

How to Pack for Airport Screening

To ensure a smooth security check:

  1. Keep it Accessible: Place your quart-sized liquid bag in an outer pocket of your carry-on so you can quickly remove it at the conveyor belt.
  2. Declare Exemptions: Inform the TSA officer if you have formula, milk, or prescription liquids. Place these items in a separate bin for manual X-ray inspection.
  3. Checked Hold Alternative: If you are unsure or have larger bottles (like full-size shampoo or sunscreen), pack them in your checked baggage to avoid confiscation.