3-1-1 for Carry-ons
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Liquids, aerosols and gels, in limited quantities, are safe to bring aboard an aircraft. Each traveler is allowed one bag in order to limit the total volume of liquids, aerosols and gels. Consolidating products into one bag and X-raying them separately from the carry-on bag enables security officers to quickly clear all items.
3-1-1 for carry-on luggage = bottle of 3.4 ounces (100 mg) or less (per volume); 1 quart transparent plastic bag hermetically sealed; 1 bag per passenger placed in the inspection container. One quart size bag per person limits the total volume of liquid that each passenger can carry. The 3.4 ounce (100 mg) container size is a security measure.
Be prepared. The line of passengers will be delayed each time TSA inspects a carry-on baggage, Abiding by the 3-1-1 application will guarantee a fast and easy experience at the checkpoint.
The 3-1-1 application is for short trips. If you are in doubt, place liquids in checked baggage
Declare larger liquids. Medications, milk and food for babies, and breast milk are allowed in reasonable quantities exceeding the three ounces (100 mg) and are not required to be placed in hermetically sealed bags. Declare these items so that they are inspected at the checkpoint. The officers may open these items to carry out additional inspections.
Latest revision: 02 August 2013
This is copied right from the TSA site. It's just the way the metric system works with our stupid measurements. 3.4 oz = 100mg.