As the Thanksgiving holiday approaches, countless Americans will embark on air travel, seeking innovative strategies to simplify their journeys. One such tip that frequently surfaces on social media platforms like TikTok is the art of carrying a full bottle of water through US airport security. The solution is straightforward: freeze the water beforehand. Surprisingly, this method is not only allowed but also endorsed by the US Transportation Security Administration (TSA). A TSA spokesperson clarified via email, "Frozen liquid items are permitted through the checkpoint as long as they are completely frozen at the time of screening." They further explained, "If the frozen items are partially melted, slushy, or contain any liquid at the bottom of the container, they must adhere to the 3-1-1 liquid rule." This rule stipulates that passengers can carry liquids, gels, and aerosols in containers not exceeding 3.4 ounces or 100 milliliters, all of which must fit into a single quart-sized bag.

In the event that your frozen bottle begins to thaw, it is advised to consume the water before placing your belongings into the security bin. It's important to note that this rule extends to carrying leftovers home after Thanksgiving. Most would concur that ingesting a partially melted serving of gravy before boarding is far from an enjoyable experience. There are exceptions to the 3-1-1 rule, such as for medically necessary liquids, gels, and aerosols, which are allowed in larger quantities in carry-on luggage and must be declared for inspection at the security checkpoint.

The TSA advises against packing any food or frozen liquid items in your carry-on that you would be unwilling to discard. The final decision on whether an item is permitted through the checkpoint rests with the TSA officer, as stated on the TSA website.

Some travelers are skeptical about the benefits of carrying frozen bottles through security. Many commenters on popular TikTok videos and blogs question the necessity, pointing out that it's more convenient to pass through security with an empty bottle and fill it at the water dispensers commonly found in airport departure areas. Others see little reason to avoid the cost of a bottle of water post-security, regardless of the price. A few have noted that the ice might melt too slowly for passengers to consume it during a short flight.

Conversely, some travelers are surprised that this hack is not more widely known, given the TSA's regular reminders on its social media platforms. Among those who find value in this hack is aviation blogger John E. DiScala, known as Johnny Jet, who has traveled over 100,000 miles annually since 1995 and visited over 100 countries. He remarked, "While I've never personally brought a frozen water bottle through security, there are instances where this travel hack is practical. Yes, you can always refill your bottle post-security, which is what I always do. However, there are times when you might not find a refilling station, encounter long lines, or simply run out of time before boarding. In such cases, having your ice-cold water on hand would be beneficial." DiScala also cited recent aviation disruptions as a reason to consider freezing a bottle of water before a flight. "Water from a refilling station is fine, but in extreme heat, nothing beats ice-cold water," he said. "This past summer, there were numerous stories of passengers stranded on delayed flights, sitting on the tarmac, who likely wished they had some cold water to stay hydrated."

When asked if some travelers might be motivated by the thrill of outsmarting airport regulations, DiScala acknowledged that this could be a factor but emphasized the practical benefits of the hack. "Of course, people enjoy travel hacks that make them feel like they're beating the system, like squeezing extra clothes into a travel pillow, but this one is not only easy and cost-effective but could genuinely contribute to your safety, hydration, and health," he said. "I never like to rely on flight attendants for water, so it's always wise to be prepared and have your own."

Travelers outside the US should verify the policy in their departure country before freezing their water bottles. For example, Canada's Air Transport Security Authority (CATSA) does not explicitly mention frozen water bottles on its website but states that gel and ice packs are subject to 100 ml liquid restrictions, as are non-solid foods, with some exceptions. A post on the CATSA website reads, "Frozen liquids, such as ice, are allowed in quantities of 100 ml (3.4 oz) or less. Food over 100 ml that is normally a liquid or gel but has been frozen solid will not be permitted to pass through security in your carry-on. For food to be considered solid, it must be solid at room temperature."