A terrorist scare involving liquid explosives in 2006 prompted the Transportation Security Administration (TSA) to ban all liquids and gels from carry-ons completely, severely limiting passenger-owned food and drink options for almost two months. Thankfully, airport security rules have become less strict in this particular regard since then. Today, you can virtually bring anything edible (liquid included) through outbound United States airport security as long as you observe size limits.
Sometimes, though, it's easy to forget what is and isn't covered by the regulations, and refuse bins on the outer side of security lines are full of cans, tubes, bottles, and more. Here is an up-to-date guide to which items of food and drink should be no-hassle for U.S. airport security and which items are better left in your checked luggage. "Should" is the operative word here, by the way: Even if a food is listed as TSA-approved, the final decision rests with the TSA officer on duty as to whether any given item will be allowed through security.
Passengers are allowed to bring alcohol through security under the 100 ml limit (about 3.4 ounces). Miniature shot-sized bottles usually come in 50ml portions, thus making it a permissible carry-on should you insist on taking a few swigs on, before, or during the flight. Be aware, though, that airline regulations generally prohibit passengers to consume any alcohol on board that hasn't been served by the in-flight staff.
TSA recommends that all carry-on gift boxes be unwrapped and easy to open should security officials need to investigate the contents. Making sure that any liquids in the gift box — edible or otherwise — weigh 3.4 ounces or less will make procedures run more smoothly.
An increasingly popular travel hack for bottle-carrying passengers is to wait until after security check to fill the bottle with water before boarding the flight (and more and more airports offer refrigerated fountains specifically for this purpose). If you’re buying a new bottle of water at the airport, don't do it until you’ve gone through screening.
If you want to give your pies and cakes an extra hit of icing for the plane ride, it’s best to dab it on directly or put in a container that holds less than 3.4 ounces. Those large canisters of frosting will need to be checked-in.
Though allowed, wrapped gifts will incite TSA security to look into the contents, and your pretty packaging might suffer in the process. A gift box with more than 3.4oz liquid containers is a definite no-no. If possible, place gifts in an easy-open gift bag instead, wait to wrap gifts until after the flight, or check them.
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You can't bring large bottles of oil or vinegar through the checkpoint so it makes sense that you can't bring large bottles of oil and vinegar through either. You probably won't need salad dressing for the flight anyway (most airlines cover the basic dressing for long-haul meals), so if you're bringing it along for any reason, into the checked bags it goes.