TSA and our security partners conducted extensive explosives testing since August 10, 2006 and determined that liquids, aerosols and gels, in limited quantities, are safe to bring aboard an aircraft. The one bag limit per traveler limits the total amount each traveler can bring. Consolidating the bottles into one bag and X-raying them separately from the carry-on bag enables security officers to quickly clear the items.
3-1-1 for carry-ons = 3.4 ounce (100ml) bottle or less (by volume) ; 1 quart-sized, clear, plastic, zip-top bag; 1 bag per passenger placed in screening bin. One-quart bag per person limits the total liquid volume each traveler can bring. 3.4 ounce (100ml) container size is a security measure.
Be prepared. Each time TSA searches a carry-on it slows down the line. Practicing 3-1-1 will ensure a faster and easier checkpoint experience.
3-1-1 is for short trips. If in doubt, put your liquids in checked luggage.
Declare larger liquids. Medications, baby formula and food, and breast milk are allowed in reasonable quantities exceeding three ounces and are not required to be in the zip-top bag. Declare these items for inspection at the checkpoint. Officers may need to open these items to conduct additional screening.
For Travelers
Passengers are asked keep in mind the following advice to help make their trip through the airport as efficient and comfortable as possible.

Transportation Security Officers (TSOs) have to resolve any anomaly detected at the checkpoint. If travelers alarm when passing through a metal detector or advanced imaging technology unit, additional screening will be required.
Advanced Imaging Technology (AIT): Before passing through this technology, TSA strongly recommends removing ALL items from pockets, as well as certain accessories, including wallet, belt, bulky jewelry, money, keys, and cell phone. Removing all of these items will reduce the chance of needing additional screening after exiting the machine. The officer viewing the image cannot see the passenger, so any irregularity that appears on the screen will require inspection to determine what it is.
For more information on this technology, click here.
Body Piercings: Certain metal body piercings may cause the machines to alarm, which will result in additional screening. If additional screening is required, passengers may be asked to remove their body piercing in private as an alternative to the pat-down search.
Head Coverings: Travelers are permitted to wear head coverings and religious garments during the screening process. They may be directed to additional screening if the headwear or clothing (religious or otherwise) is loose fitting or large enough to hide prohibited items. For more information, click here.
Shoes: Please remove shoes before entering the screening technology and put them directly on the belt to go through the X-ray machine instead of in a bin with other items. It is safe, easy, and gives officers a better look.
Passengers with disabilities, medical conditions or a prosthetic device that prevents them from removing their shoes, should notify a security officer. These passengers will be given additional screening that includes a visual and physical inspection.
Why do we screen shoes? TSA instituted mandatory shoe screening as an additional security measure when the threat level for the aviation sector was raised on August 10, 2006. Screening shoes by X-ray is an effective method of identifying any type of anomalies, including explosives. Screening shoes increases security at the checkpoint.
Read our Press Release and view an X-ray image of simulated explosives in a pair of shoes.

Passengers should present the following documents to a Transportation Security Officer at the checkpoint:
Passengers without identification (lost, stolen, etc.), will be required to provide the document checking officer with some information to help verify their identity. Please allow additional time since this slows down the screening process and will result in additional screening. (Children are not required to show identification).