TSA Carry-On & Liquid Rules: 3-1-1 Liquids Rule Explained
Navigating TSA security screening efficiently starts with understanding the 3-1-1 liquids rule, prohibited items list, and laptop carry-on guidelines.
Senior Travel Editor & Aviation Specialist
Guide Summary & Essential Takeaways
Navigating TSA security screening efficiently starts with understanding the 3-1-1 liquids rule, prohibited items list, and laptop carry-on guidelines.
Key Travel Facts & Insights
- 3.4 oz (100ml) maximum per container
- 1 quart-sized clear resealable plastic bag
- 1 bag per traveler presented separately at security
- Medications & Infant Formula Exceptions
- Electronics & Powdered Substances
The 3-1-1 Liquids Rule Demystified
TSA allows travelers to carry liquids, gels, and aerosols in containers of 3.4 ounces (100 milliliters) or smaller. All liquid containers must fit into a single 1-quart clear zip-top bag. Each passenger is allowed one quart bag.
- 3.4 oz (100ml) maximum per container
- 1 quart-sized clear resealable plastic bag
- 1 bag per traveler presented separately at security
Medications & Infant Formula Exceptions
Medically necessary liquids, prescription drugs, baby formula, breast milk, and juice are exempt from the 3-1-1 liquids rule. You must declare these items to TSA officers prior to screening.
Electronics & Powdered Substances
Laptops and electronics larger than a cell phone must be removed from carry-on bags for separate X-ray screening unless in a TSA PreCheck line. Powdered substances over 350ml (12 oz) may require additional inspection.
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Frequently Asked Questions
Are full-size toothpaste tubes allowed in carry-on bags?
No, toothpaste is considered a gel and must be 3.4 ounces (100ml) or smaller to pass through TSA security.
Can I bring solid food through TSA security?
Yes, solid food items like sandwiches, fruit, snacks, and nutrition bars are permitted in carry-on bags.