The Transportation Security Administration is considering allowing some TSA PreCheck members to carry full water bottles through selected security checkpoints. No final nationwide policy has been announced, and the familiar 3-1-1 liquids rule remains in force.
WASHINGTON, D.C. | Published at 3:06 p.m. EDT
The familiar airport ritual of hurriedly finishing a drink or pouring it into a trash can before reaching security could soon disappear for some American travelers.
The Transportation Security Administration is actively considering a policy that would allow certain TSA PreCheck passengers to bring full water bottles through security at a limited number of airports equipped with newer computed tomography scanners, according to senior administration officials cited by CBS News.
The proposal would represent one of the most visible changes to American airport screening in two decades. It would not, however, immediately end the liquids restriction for everyone.
As of September 14, 2026, TSA has not announced a final change. Travelers should continue to arrive at U.S. checkpoints with reusable water bottles empty unless their liquid qualifies for an established exemption.
The agency’s existing rule still limits ordinary liquids, aerosols, gels, creams and pastes in carry-on baggage to containers holding no more than 3.4 ounces, or 100 milliliters. Those containers must fit inside one quart-sized, resealable bag, with one bag allowed per passenger.
A normal 16-ounce, 20-ounce or larger water bottle exceeds that limit.
The possible policy change is significant because officials are reportedly discussing a real operational trial rather than a distant technological goal. Yet several unanswered questions remain, including when the program might start, which airports would participate, what bottle sizes would be permitted and whether the privilege would extend beyond TSA PreCheck.
For now, the practical answer is simple: full water bottles are not generally allowed through U.S. airport security, but a limited exception for trusted travelers appears closer than it has been since the restriction began.
The proposal would start with TSA PreCheck
The contemplated policy would reportedly apply first to travelers enrolled in TSA PreCheck, the government’s trusted-traveler screening program.
PreCheck members undergo an application process, provide identifying information, pay an enrollment fee and receive a Known Traveler Number after approval. At participating checkpoints, they usually receive a more streamlined screening experience.
Senior administration officials told CBS News that the water-bottle allowance could begin at selected airports in the coming months. The initial locations would need newer computed tomography screening equipment and automated detection capabilities that can distinguish harmless liquids from potential threats.
Officials did not publicly identify the airports under consideration.
The Department of Homeland Security stopped short of confirming that a decision had been made.
“TSA will continue to explore opportunities to enhance security and improve the traveling experience for the public,” DHS said in a statement reported by The Washington Post.
The department said TSA’s layered security procedures would continue evolving with technology, including benefits offered to trusted travelers. It added that any formal policy change would be announced through official TSA channels.
That language confirms an evaluation, not a completed rule change. Until TSA publishes an effective date, participating airports and passenger instructions, PreCheck members remain subject to the ordinary liquids limit.
Why water has been restricted since 2006
The 3-1-1 rule emerged from a genuine aviation-security threat rather than an attempt to force passengers to purchase expensive drinks inside airport terminals.
In August 2006, British authorities disrupted a plot to detonate liquid explosives aboard transatlantic aircraft traveling from the United Kingdom to North America. Officials said the conspirators intended to conceal components inside ordinary beverage containers.
The discovery prompted governments to impose sweeping restrictions on liquids in aircraft cabins. The United States initially prohibited nearly all liquids and later adopted the 3-1-1 framework.
The name summarizes the rule:
- Each container may hold no more than 3.4 ounces, which is approximately 100 milliliters.
- Permitted containers must fit inside one quart-sized bag.
- Each traveler may carry one liquids bag.
The restriction applies based on the capacity printed on the container, not the small amount that happens to remain inside it. A half-empty 12-ounce shampoo bottle is still considered a container larger than 3.4 ounces.
For years, conventional checkpoint X-ray equipment could show security officers the shape, density and location of items inside a bag but could not reliably determine whether a bottle contained water, shampoo, fuel or an explosive mixture without additional inspection.
Restricting the amount of liquid reduced the potential quantity available for an attack while allowing travelers to carry small toiletries.
CT scanners are changing what officers can see
The possible relaxation is being driven by computed tomography technology similar in principle to medical CT imaging.
Traditional checkpoint X-rays generally produce flat, two-dimensional views of a carry-on bag. CT systems capture many X-ray measurements and use sophisticated algorithms to build a three-dimensional image.
Security officers can rotate that image, examine objects from multiple angles and obtain more information about materials inside the bag.
According to the TSA’s official explanation of computed tomography screening, the systems use advanced algorithms to detect explosives and other threats while producing a 3D image that officers can manipulate through a full 360-degree view.
The technology can reduce the need for passengers to remove laptops and small permitted liquids from their bags. More advanced detection may also allow the system to evaluate the contents of larger bottles.
That does not mean every checkpoint displaying a new-looking scanner is ready to approve full drinks.
Equipment models, software certifications and operating procedures differ. A machine capable of producing 3D images may still be operating under national rules that require officers to reject a full water bottle.
Passengers must follow the posted instructions and the directions of the officers at their specific checkpoint.
The equipment is not available everywhere
The biggest obstacle to a nationwide change is uneven deployment.
Major airports may operate several checkpoint areas with different generations of equipment. One terminal could have CT machines while another at the same airport still uses conventional X-ray systems.
Smaller airports may not have the newer scanners at all.
TSA has been investing heavily in the transition. In 2023, the agency announced contracts worth up to $1.3 billion to acquire additional checkpoint CT systems. The Department of Homeland Security has continued planning further purchases because TSA considers CT one of the most consequential technologies available for screening carry-on property.
Installation involves more than placing a machine on a conveyor belt. Airports may need electrical work, stronger floors, modified checkpoint layouts, networking changes and officer training. CT equipment can be larger and heavier than the scanners it replaces.
Even if TSA approves full water bottles for PreCheck travelers, the program could create a patchwork in which a passenger may carry water through one airport but not through the security checkpoint for the return trip.
It could also vary inside a single airport if only certain lanes have the necessary equipment.
TSA would need clear signs and advance information to prevent travelers from assuming that a successful experience at one location establishes a nationwide right.
Why PreCheck could become the testing ground
Limiting the initial program to PreCheck passengers would give TSA a smaller, pre-enrolled population for testing new procedures.
Trusted-traveler lanes are already designed around risk-based screening. PreCheck members often keep on light jackets and belts and leave approved electronics inside their bags, depending on the equipment and instructions at the checkpoint.
A water-bottle trial could measure how effectively CT systems identify liquids, how often bottles trigger alarms and whether officers can resolve those alarms without creating longer lines.
It would also allow TSA to determine whether leaving bottles inside bags speeds screening or instead produces additional manual inspections.
There is an equity question. TSA PreCheck requires travelers to apply and pay a fee, although some credit cards or employers reimburse the expense. If a basic convenience such as carrying water becomes available primarily to paying trusted travelers, families and infrequent flyers may question why technology is not being extended equally.
TSA could argue that a controlled PreCheck rollout is a safety test rather than a permanent two-tier liquids policy. The long-term credibility of that position would depend on whether a successful trial eventually expands to the general public.
Full water bottles would not mean all liquids are allowed
Even if TSA implements the reported proposal, travelers should not assume that full-size shampoo, perfume, alcohol, soup and every other liquid would automatically be permitted.
The available reporting specifically concerns water bottles. TSA could create a narrow exception for plain water because screening technology may identify it more predictably than liquids containing complex ingredients.
Officials would need to specify whether the rule covers:
- Factory-sealed disposable water bottles
- Filled reusable bottles
- Flavored or carbonated water
- Sports and electrolyte drinks
- Coffee and tea
- Juice and soda
- Frozen beverages
- Other liquids in similar containers
Security officers could still inspect a bottle separately, open it, test it or prohibit it if the equipment produces an alarm.
TSA’s “What Can I Bring?” guidance states that even generally permitted items may require additional screening or be refused if they appear tampered with, trigger an alarm or present another security concern. The final checkpoint decision rests with TSA.
What travelers should do right now
Travelers flying from U.S. airports should continue following the existing TSA liquids, aerosols and gels rule.
Bring a reusable water bottle, but empty it before entering the security line. Most larger airports provide bottle-filling stations after the checkpoint, and restaurants or concession stands may fill a container upon request.
A metal, glass or plastic bottle is generally acceptable when empty, although it remains subject to inspection.
Do not fill a bottle based on rumors that your airport has a CT scanner. The presence of new screening equipment does not change the rule unless TSA has officially activated a different procedure at that checkpoint.
If an airport eventually joins a pilot program, verify the details on TSA’s website or through the airport before traveling. Check again for the return flight because the departure airport may follow different procedures.
Passengers can also contact AskTSA through the agency’s social-media channels or by texting “Travel” to 275-872 for current guidance.
Existing exceptions remain available
The 3-1-1 rule already contains important exceptions for medically necessary liquids and certain items needed when traveling with children.
Breast milk and infant formula may be carried in quantities greater than 3.4 ounces. TSA considers them medically necessary liquids. Parents do not need to be traveling with a child to transport breast milk, according to official TSA guidance.
Toddler drinks, baby food, liquid-filled teethers and cooling accessories used for formula or breast milk may also receive special treatment. Travelers should inform an officer at the beginning of screening and expect the items to undergo separate examination.
Medically necessary water may be permitted when required for a health condition, medication or medical device. Passengers should declare it to officers rather than place it silently inside an ordinary carry-on.
Prescription and over-the-counter liquid medications may exceed the standard limit when medically necessary. They do not have to fit inside the quart-sized toiletries bag, but they must be presented for screening.
Ice packs and frozen liquids can be treated differently if they are completely frozen when presented. If they are partially melted, slushy or contain liquid at the bottom, ordinary liquids restrictions may apply unless they support a medically necessary item.
These exceptions are not new and do not depend on the proposed PreCheck water-bottle program.
Travelers should distinguish U.S. and foreign rules
Airport-security policies are determined by the country and airport where the passenger is being screened, not simply by the airline or final destination.
Several European airports have introduced advanced CT scanners and, at various times, allowed larger liquid containers. European authorities later restored the 100-milliliter restriction at some locations while equipment and certification questions were reviewed.
A traveler who carries a large bottle through an overseas airport may still have to empty it during a connecting or return journey through a checkpoint applying stricter rules.
The reverse is also possible. An American airport may eventually allow a PreCheck member to carry water through a qualifying lane, but the foreign airport used for the return trip may not recognize TSA PreCheck or the same exception.
Travelers should check every airport on an itinerary, especially when a connection requires passengers to clear security again.
Would ending the water restriction improve travel?
Allowing passengers to bring water through security could produce meaningful, if modest, benefits.
Travelers would no longer need to waste water immediately before screening. Families, older passengers and people prone to dehydration could keep drinks available. Fewer disposable bottles might be purchased inside terminals, reducing plastic waste.
Passengers could also avoid high airport concession prices for bottled water.
The operational effect is less certain. Full bottles would add dense objects to carry-on images. If CT systems can automatically clear them, screening could become easier. If bottles frequently trigger alarms, officers may have to remove and test them, slowing the line.
A well-designed pilot program should measure alarm rates, processing time, officer workload and passenger compliance before a larger rollout.
Security effectiveness must remain the controlling consideration. Convenience would not justify a relaxed rule if scanners or procedures could not reliably identify a liquid threat.
The likely future is gradual, not nationwide overnight
The TSA appears to be moving toward a checkpoint system in which rules respond to the equipment and verified risk of each traveler.
That could eventually make the universal liquids limit unnecessary. It could also create an awkward transition lasting years, with different rules for different airports, terminals and passengers.
The agency’s immediate challenge is communication. A headline announcing that TSA “may allow full water bottles” can easily become a social-media claim that full bottles are already permitted.
They are not.
The most accurate conclusion on September 14 is that TSA is considering a limited rollout for some PreCheck passengers at airports with appropriate CT screening technology. DHS has not announced a starting date, participating airport list or final policy.
Travelers who show up today with an ordinary full bottle should expect to drink it, discard it or empty it before passing through security.
The twenty-year-old rule may finally be approaching a significant test. Until TSA formally says otherwise, however, the safest bottle to carry into the checkpoint is still an empty one.
Reporting disclosure
This report relies on current TSA rules, official descriptions of checkpoint technology and publicly attributed reporting about the proposed policy. TSA has not formally approved or implemented the reported water-bottle exception as of publication.
Source
- Transportation Security Administration, Liquids, Aerosols and Gels Rule, current checkpoint guidance.
- Transportation Security Administration, Computed Tomography, official explanation of CT checkpoint technology.
- Transportation Security Administration, Breast milk, formula and juice exceptions, current family-travel guidance.
- CBS News, Some TSA PreCheck travelers may soon be able to bring full water bottles through security, September 9, 2026.
- The Washington Post, Will full water bottles finally be allowed through airport security?, September 11, 2026.
- Transportation Security Administration, TSA awards up to $1.3 billion for additional CT checkpoint scanners, April 12, 2023.
- Federal Aviation Administration, PackSafe guidance for alcoholic beverages, updated April 13, 2026.