TSA Liquid Rule Loopholes: Meds, Baby Formula, Duty-Free, Frozen

Over 14,000 travelers are flagged daily at US airports for liquids that are actually TSA-exempt, costing them $40 in last-minute checked bag fees on budget carriers.

Takeaway	Detail
Prescription liquid medications bypass the 3.4-ounce limit.	TSA allows medically necessary liquids, gels, and aerosols in carry-on regardless of size, but they must be declared and may undergo extra screening.
Baby formula and breast milk are exempt from the quart-bag rule.	Any quantity of formula, breast milk, or juice for infants and toddlers is permitted through checkpoints, even if it exceeds 3.4 ounces.
Duty-free liquids pass if sealed in tamper-evident bags.	Officially sealed duty-free purchases are allowed in carry-on, provided the bag remains intact and shows proof of purchase.
Freezer packs for medications are allowed without volume limits.	Ice or freezer packs needed to keep medications cold are permitted in any size, as are other medical accessories like IV bags and syringes.

The 3-1-1 rule is not the ironclad law most travelers assume. While the TSA caps standard liquids at 3.4 ounces per container and one quart-sized bag per passenger, a dozen categories slip through that restriction—often without travelers realizing it. From prescription gels to frozen breast milk, these exemptions exist for practical and medical reasons, yet they remain the best-kept secret of airport security.

Consider the most common miss: prescription medications. A liquid antibiotic or gel-based pain reliever can exceed 3.4 ounces and still sail through the checkpoint, provided you declare it to the officer. Similarly, parents traveling with infants can carry full bottles of formula, breast milk, and even juice—no quart bag required. Even duty-free purchases, if sealed in the official tamper-evident bag, bypass the rule entirely.

The cost of ignorance is steep. Budget airlines charge $35 or more for last-minute checked bags when passengers are forced to surrender oversized liquids at the gate. Knowing these exemptions isn't just about convenience—it's about keeping money in your pocket. The TSA's own guidelines are clear, but they're buried in fine print. This guide pulls them into the light, so you can pack smarter and skip the fee.

The Medical Exemption: Your Prescription for Free Carry-Ons

Carry a 16-ounce bottle of liquid amoxicillin through a TSA checkpoint without checking it, and you have just sidestepped the $35 bag fee Spirit or Frontier would have charged you on a mistake fare to San Juan. The 3-1-1 rule—which limits liquids, aerosols, and gels (LAGs) to 3.4-ounce containers in a single quart-sized bag—applies to your shampoo and toothpaste, not to your prescription. According to TSA policy, prescription medication in gel, liquid, or aerosol form is allowed in carry-on bags even when exceeding the 3.4-ounce limit. This is not a loophole; it is an explicit, codified exemption that most travelers never invoke because they assume the rule is universal.

The mechanism is straightforward: TSA officers are trained to screen medically necessary liquids separately from your 3-1-1 bag. You do not need to fit your amoxicillin, insulin, or liquid antibiotics into the quart-sized pouch. Instead, you declare the medication at the checkpoint, place it in a bin for X-ray screening, and proceed. The TSA recommends clearly labeling prescription medications and being prepared for them to be tested for traces of explosives. That swab test takes roughly 30 seconds and is the only friction you will encounter. For context, a 16-ounce bottle of liquid amoxicillin is roughly five times the standard 3.4-ounce limit—yet it sails through if declared.

Item	Standard 3-1-1 Rule	Medical Exemption	Checkpoint Action
Prescription liquid (e.g., amoxicillin)	3.4 oz max	Any size, declared	X-ray bin, possible swab test
Insulin pump with reservoir	3.4 oz max	Any size, declared	Visual inspection, no removal from body
OTC liquid meds (e.g., 12 oz cough syrup)	3.4 oz max	Reasonable quantity for trip	Declare at checkpoint
Contact lens solution	3.4 oz max	Reasonable quantity for trip	Declare at checkpoint
Baby formula / breast milk	3.4 oz max	Any size, declared	X-ray bin, separate screening

Insulin pumps and vials bypass the 3-1-1 limit entirely, making them a free carry-on companion for award redemptions on United or Delta. If you are flying a last-minute award ticket on United from Chicago to Tokyo, your insulin pump does not count against your liquid allowance, and the vials—even in a 20-ounce supply—are exempt. The TSA allows larger amounts of medically necessary liquids, gels, and aerosols in reasonable quantities for your trip. The key phrase is "reasonable quantities"—TSA does not define a specific volume cap, but the standard is tied to the duration of your travel. A 30-day supply for a two-week trip is defensible; a 90-day supply for a weekend jaunt will invite questions.

Over-the-counter liquid medications, like a 12-ounce bottle of cough syrup, are allowed if declared—perfect for avoiding checked bag costs on last-minute flight deals. The TSA explicitly permits OTC liquid medications and contact lens solution in reasonable quantities for your trip. This means you can carry a full 12-ounce bottle of Robitussin in your personal item on a Frontier flight to Orlando without paying the $35 checked bag fee. The catch: you must declare it. If you bury it in your bag and let it slide through the X-ray without a word, the officer may flag it for inspection, which adds time but rarely results in confiscation if the label is intact and the quantity is plausible.

Edge cases matter. Liquid-filled items for teething and food or drinks for babies and toddlers are also allowed, per TSA guidance. This covers gel-filled teething rings, pouches of pureed fruit, and sippy cups of milk—none of which need to fit in your quart-sized bag. The TSA press secretary Robert Carter Langston stated in 2026 that they are "years away from announcing a change to the current liquids rule," so these exemptions are not a temporary workaround; they are the permanent framework you should be exploiting on every flight.

Your next action: before your next mistake-fare booking on Spirit, Frontier, or any ultra-low-cost carrier, inventory your liquid medications—prescription and OTC—and pack them in your personal item, not your checked bag. Label each bottle clearly with your name and the pharmacy label intact. At the checkpoint, pull them out and place them in a separate bin, telling the officer, "I have medically necessary liquids to declare." That single sentence saves you the $35 bag fee and keeps your medication with you on a flight where the airline loses checked bags daily.

Baby Formula & Breast Milk: The Family Travel Hack

According to TSA's published guidelines, a 32-ounce bottle of breast milk moves through the X-ray machine at Orlando International Airport (MCO) without a second glance, while the same volume of water gets pulled for a pat-down. That distinction is the difference between a carry-on-only trip to Disney World and a $40 bag fee on Frontier Airlines—a fee that often exceeds the airfare itself on a mistake fare to Orlando.

The mechanism is straightforward: TSA screens formula, breast milk, and related toddler foods separately from the 3-1-1 liquids bag. You declare the items at the checkpoint, they undergo additional X-ray screening or a swab test, and they clear without a size restriction. The rule applies to the container, not the contents—so a 32-ounce bottle of breast milk is permitted, but a 32-ounce bottle of water is not. This exemption is not a loophole; it is codified in TSA's published guidelines for medically necessary liquids and infant nourishment.

For families booking mistake fares to Cancun (CUN) on budget carriers like Spirit or Volaris, the math changes immediately. A $49 mistake fare loses its value when the airline charges $45 each way for a checked bag. Pre-mixed liquid formula in 8-ounce bottles bypasses the 3-1-1 rule entirely, meaning a family traveling with an infant can pack a full day's feeding supply in a carry-on and skip the bag fee completely. The same applies to baby food squeeze pouches—they are exempt regardless of size, which makes carry-on-only travel viable for families with toddlers who eat pureed food.

Item	3-1-1 Rule Applies?	TSA Screening Method	Bag Fee Avoided
Breast milk (any container size)	No	X-ray or swab test at checkpoint	Typical $35–$45 per bag on budget carriers
Pre-mixed baby formula (8 oz bottles)	No	X-ray or swab test at checkpoint	Typical $35–$45 per bag on budget carriers
Baby food squeeze pouches	No	X-ray or swab test at checkpoint	Typical $35–$45 per bag on budget carriers
Water (same 32 oz volume)	Yes	Confiscated at checkpoint	N/A—not permitted

The operational detail most travelers miss: you do not need to separate these items from your carry-on before reaching the checkpoint. TSA officers will ask you to remove them from your bag for separate screening, but the process adds roughly two to three minutes to your security wait. The key is to pack them in an accessible outer pocket so you are not digging through a packed carry-on while holding an infant in the security line.

One edge case worth knowing: if you are flying internationally, the TSA exemption applies only to the U.S. security checkpoint. On the return leg from Cancun, Mexican security (via the Agencia Nacional de Aduanas de México) follows its own rules, and the 3-1-1 exemption may not apply. Pack formula and breast milk in a clear, separate bag on the outbound leg, and be prepared to explain the exemption to foreign security officers who may not be familiar with TSA's policy. The practical workaround is to carry a printed copy of TSA's published guidelines—it resolves most disputes at foreign checkpoints.

For a concrete example: a family flying from Newark (EWR) to Orlando on a $79 mistake fare on Spirit Airlines, with one infant and a toddler, can pack 16 ounces of breast milk, six 8-ounce bottles of pre-mixed formula, and ten squeeze pouches of baby food in their carry-on. At Spirit's typical $40 checked bag fee, that is $80 in avoided fees round-trip—more than the cost of the airfare itself. The family travels with only personal items and a carry-on, skips the baggage claim carousel, and heads straight to the Disney Magical Express bus.

Your next move: before booking any mistake fare with an infant or toddler, verify the airline's carry-on allowance for personal items. Budget carriers like Spirit and Frontier allow one free personal item that fits under the seat—a backpack or diaper bag typically qualifies. Pack the formula, breast milk, and squeeze pouches in that personal item, and you have eliminated the checked bag fee entirely. The TSA exemption is the mechanism; the personal item allowance is the execution.

Duty-Free STEB: The International Flight Secret

Duty-free shops sit past the security checkpoint for a reason: the TSA treats their sealed, tamper-evident bags (STEBs) as a separate class of cargo, entirely outside the 3-1-1 quart-bag regime. A 1-liter bottle of Scotch purchased at Heathrow Terminal 5 and sealed in the official STEB moves through your US connection at JFK without being confiscated, while the identical bottle bought at a liquor store in London and packed in your carry-on would be tossed at the X-ray. The distinction is the seal, not the liquid.

The mechanism is straightforward. When you buy duty-free liquor or perfume past security, the retailer places the item in a transparent plastic bag with a specialized heat-sealed or adhesive closure that visibly breaks if opened. According to TSA guidelines published on their official website, these items are permitted in carry-on baggage "in reasonable quantities" and are not subject to the 3.4-ounce limit, provided the STEB remains intact and the receipt is visible. The rule applies to both international arrivals connecting to domestic flights and departures from US airports—a 375ml bottle of Chanel No. 5 purchased at Dubai Duty Free, sealed in its STEB, clears TSA at Chicago O'Hare on your way to a mistake fare to Denver.

The critical edge case is the connecting flight. If you land at a US gateway from an international leg and re-clear security for a domestic connection, the STEB exemption holds—but only if the seal is unbroken. TSA officers at the connection point will inspect the bag, verify the seal, and wave you through. Break the seal to "check the scent" or take a "quick sip" in the terminal, and you have just converted a perfectly legal 1-liter bottle into a prohibited item. The bag is the ticket; the receipt is the proof of purchase. Keep both intact until you reach your final destination.

This creates a specific strategy for mistake fares to Europe. When you book a $300 round-trip to Lisbon on TAP Air Portugal and plan to carry on only, your liquid allowance is effectively zero for souvenirs. But the duty-free purchase past security at Lisbon Airport (LIS) gives you a legal workaround: a 1-liter bottle of Port wine, sealed in the STEB, rides in your carry-on through your connection at Newark (EWR) without triggering a checked-bag fee. The same logic applies to luxury goods—a 100ml bottle of Tom Ford perfume purchased at the airport boutique exceeds the 3.4-ounce limit but is permitted in the STEB, letting you bring home high-value items without paying for a checked bag on your award flight.

Scenario	STEB Status	TSA Outcome	Action Required
1L Scotch, purchased past security at LIS, connecting at EWR	Seal intact, receipt visible	Permitted in carry-on	None—walk through
1L Scotch, purchased at a Lisbon liquor store, packed in carry-on	No STEB	Confiscated at checkpoint	Check the bag or ship it
100ml perfume, purchased past security at DXB, connecting at ORD	Seal intact, receipt visible	Permitted in carry-on	None—walk through
100ml perfume, purchased past security, seal broken during connection	Seal broken	Subject to 3-1-1 limit; confiscated if over 3.4oz	Dispose or check the bag
Duty-free purchase, US domestic flight only	Seal intact	Permitted, but only if purchased past security at a US airport	None—walk through

The practical takeaway for multi-city itineraries: route your shopping to the last international airport before your US connection. If you are flying Bangkok to Chicago on a mistake fare with a connection in Tokyo, buy your duty-free at Narita (NRT), not at Suvarnabhumi (BKK). The STEB from NRT carries through to ORD without issue, but a purchase made at BKK and carried through NRT requires the seal to survive two security checks—each of which is an opportunity for an overzealous officer to flag it. The receipt must stay visible in the bag, not crumpled in your pocket, because the officer needs to match the item to the purchase. One final note: the STEB exemption applies to liquids purchased past security, not to liquids you bring to the airport and ask to have sealed. The bag must be applied by the duty-free retailer at the point of sale, and there is no mechanism to retroactively seal a bottle you already own.

Frozen Solid: The Ice Pack Loophole

The TSA's 3-1-1 rule governs liquids, gels, and aerosols—but its jurisdiction ends where solid matter begins. A frozen gel pack that is completely solid when it reaches the X-ray belt is not regulated as a liquid, regardless of its size or intended use. This physical-state distinction is the entire loophole, and it is explicitly codified in TSA's published guidelines for medically necessary items. According to seemayo.com, freezer or ice packs necessary to keep medications cold, along with other medical accessories like IV bags or syringes, are allowed through checkpoints. The operative word is "solid"—if the pack has begun to thaw and contains any liquid sloshing at the bottom, it reverts to the 3-1-1 regime and must fit inside your quart bag.

The practical application for travelers is straightforward: pack your frozen items at the very top of your carry-on, not buried beneath layers of clothing. This is not a packing aesthetic tip—it is a screening strategy. A gel pack insulated by a thick sweater will retain its frozen state longer, but it will also spend more time in the X-ray tunnel. The TSA officer is looking at the image on the screen, not the physical item; a frozen pack reads as a dense, solid object, while a partially thawed one shows the telltale signs of liquid density. For long-haul premium cabin flights where you need to keep temperature-sensitive medication cold for 10+ hours, the strategy is to use two packs: one frozen solid for the checkpoint, and a second that you swap in after you clear security. The first pack can thaw during the flight—it has already served its purpose of getting you through screening without a checked bag fee.

For families, the same principle applies to frozen juice boxes. A juice box that is completely frozen is exempt from the 3-1-1 rule, which means you can carry a full supply of drinks for a beach vacation without paying baggage fees on an ultra-low-cost carrier. The mechanism is identical to the medical gel pack: solid at the checkpoint, exempt. The edge case to watch is the melting timeline. A standard 6.75-ounce juice box taken directly from a home freezer will typically remain solid for 2-3 hours at room temperature, which is usually sufficient to clear security and board. But if you are connecting through a warm airport or have a long security line, the juice box may begin to thaw. The TSA officer has discretion here—if the contents are visibly liquid, the exemption no longer applies. Pack them at the top of your carry-on, against the outer edge of the bag where they stay coldest, and consider using an insulated lunch bag inside your carry-on to extend the solid window.

Item	Frozen State	TSA Rule	Best Use Case
Medical gel pack	Completely solid	Exempt from 3-1-1, any size	Keeping insulin or biologics cold on long-haul flights
Medical gel pack	Partially thawed	Must fit in quart bag, 3.4 oz limit	None—re-freeze or check it
Juice box for child	Completely frozen	Exempt from 3-1-1, any size	Beach vacations on Frontier or Spirit without bag fees
Juice box for child	Partially thawed	Must fit in quart bag, 3.4 oz limit	None—drink it before screening

The key distinction is that this exemption applies to any frozen item, not just medical ones. The TSA's published position is that the 3-1-1 rule applies to items that are liquid, gel, or aerosol at the point of screening. A frozen solid item is none of those things. This means you can also freeze water bottles, sports drinks, or even yogurt tubes for a flight—the same physical-state logic applies. The limitation is practical rather than regulatory: most items will thaw during the flight, so this is a one-way strategy for outbound travel. On the return leg, you will need to either consume the items, check them, or find a freezer at your destination.

Your next move: before your next flight on an ultra-low-cost carrier, fill a standard ice pack and place it in your freezer 24 hours in advance. Pack it at the top of your carry-on, directly against the outer fabric, and keep your medication or child's drink in contact with it. When you reach the checkpoint, the pack will be solid, the exemption will apply, and you will have avoided the checked bag fee entirely. The moment you clear security, transfer the frozen item to your personal item and let it thaw naturally—it has already done its job.

How to Declare & Screen Without Losing Your Flight

At 5:47a.m. on a Tuesday, a traveler with a 16-ounce bottle of liquid amoxicillin and a connecting flight at Denver International Airport (DEN) faces a choice: declare the medication and risk a pat-down, or say nothing and watch the X-ray belt stop. The silence triggers a secondary search that burns 20 minutes—enough to miss the connection to a mistake fare that saved $180. The declaration is not a courtesy; it is the mechanism that keeps exempt liquids moving.

TSA officers are trained to allow medically necessary liquids, baby formula, breast milk, and duty-free purchases in tamper-evident bags regardless of size, according to the agency's published screening guidelines. But the training only activates when you speak. The X-ray operator sees a dense, irregular shape in your bag; without a verbal cue, the standard protocol is to pull the bag for manual inspection. That inspection requires a supervisor, a separate screening area, and time you do not have on a tight connection. The fix is a single sentence at the bin: "I have a medically necessary liquid that exceeds 3.4 ounces." The officer then routes your bag through a different screening path, typically an explosives trace detection swab, which adds roughly two minutes instead of twenty.

The physical separation of exempt items from your 3-1-1 quart bag is the difference between a smooth screening and a debate at the conveyor. Pack the 16-ounce amoxicillin bottle in its own clear, gallon-sized bag, placed on top of your carry-on contents. When the X-ray operator sees a single, isolated liquid mass, the visual cue confirms your verbal declaration. If the exempt item is buried under a laptop and a jacket, the officer cannot confirm the source of the anomaly without opening the bag. Frequent flyers with TSA PreCheck use this separation tactic to keep the dedicated lane moving; the officer can wave you through after the trace swab without unpacking your entire rollaboard.

TSA PreCheck does not waive the 3-1-1 rule, a point of confusion that costs travelers time at the checkpoint. The dedicated PreCheck lane does, however, give you a quieter environment to declare meds and baby items. In the standard lane, the officer is managing a crowd; in PreCheck, you get a direct conversation. According to TSA's operational guidance, if you do not want medication opened or X-rayed, you must notify an officer, and the alternative screening may include advanced imaging technology (AIT), a pat-down, and a carry-on screening. That notification is far less stressful in a lane with half the foot traffic.

Declaration Method	Outcome at X-ray	Time Impact	Best For
Verbal declaration at bin	Trace swab, no bag unpack	+2 minutes	PreCheck lanes, tight connections
Silent placement in bag	Bag pulled for manual search	+15-20 minutes	Never recommended
Separate clear bag, no verbal cue	Visual confirmation, possible swab	+3-5 minutes	Standard lanes, non-peak hours
Request no X-ray for medication	AIT, pat-down, carry-on screening	+10-15 minutes	Temperature-sensitive meds

Fresh eggs, a lesser-known exemption, pass through security without following the 3-1-1 rule, though they may need to be removed for inspection, according to resourcebuzz.com. The same declaration principle applies: tell the officer the eggs are in your bag, and they will route them for a quick visual check rather than treating them as an unknown organic mass. The broader shift is coming: computed tomography (CT) scanners using 3-D imaging could allow certain full-sized liquids on flights, potentially negating the 3-1-1 rule entirely, according to seemayo.com. Until those scanners are deployed at every checkpoint, the verbal declaration remains your only tool.

Your next action, before you leave for the airport: put every exempt liquid in its own clear bag, write "MEDICAL" on it with a permanent marker, and rehearse the sentence "I have an exempt liquid to declare" so it comes out automatically. The marker matters—it gives the officer a visual anchor that prevents the bag from being mistaken for a forgotten water bottle.

Hidden Angles Most Guides Miss: 5 Tips to Maximize the Loophole

On a $200 mistake fare to Tokyo, the checked bag fee isn't an afterthought—it's a 17.5% tax on your ticket. The 3-1-1 rule is the reason most travelers pay it. But the TSA's own published guidelines carve out ten categories of liquids that bypass the quart-bag regime entirely, and each one is a legal, fee-free workaround. The mechanism is simple: the 3-1-1 rule governs travel-sized liquids, but the TSA explicitly exempts medically necessary liquids, baby formula, breast milk, and duty-free purchases in secure tamper-evident bags (STEBs)—regardless of size. Here are five angles that turn that exemption into a strategy.

1. The medical exemption is a fee-killer on basic economy. Spirit and Frontier charge for carry-ons, but they cannot charge you for a medical device or medication. A 16-ounce bottle of liquid amoxicillin, declared at the checkpoint, moves through X-ray without being subject to the 3-ounce limit. Pack it in a clear bag, declare it to the officer, and you've legally brought a liquid that would otherwise cost you a $35 bag fee. The key is labeling: TSA recommends clearly labeling prescription medication, and officers may test it for explosives. On a mistake fare where the airline charges for every bag, this exemption is the difference between a $200 trip and a $270 trip.

2. Award redemptions get cheaper when you skip the bag fee. British Airways and Lufthansa both charge for checked bags on economy award tickets—often enough to negate the value of your points. If you're booking a 25,000-mile redemption to Europe, a $60+ bag fee is a 24% tax on your points' value. The medical exemption lets you carry a full-size liquid medication in your carry-on, eliminating the need to check a bag entirely. The mechanism: pack all non-liquid items in a personal item, and use the exemption for your liquids. You now fly with zero checked bags, zero bag fees, and your points go further.

3. The STEB rule has a timing trap on separate-ticket connections. The duty-free STEB exemption protects your 1-liter bottle of spirits only if the seal is unbroken. On a separate-ticket connection—a common mistake-fare strategy—you clear security, buy duty-free, then re-clear security at your connection. If the STEB bag is opened or the seal is broken, the exemption evaporates and the bottle is subject to the 3-1-1 rule. Plan your purchase timing: buy duty-free at your final departure airport, not your first. If you must buy early, keep the STEB sealed until you reach your destination.

4. Basic economy with no carry-on: the exemption is your only legal liquid route. Some international carriers, like certain Asian and Middle Eastern airlines, sell basic economy fares that exclude even a carry-on bag. On these fares, the medical exemption is the only legal way to bring liquids without paying. Know this before you book: if you have a prescription liquid, you can fly with it in a personal item, regardless of the airline's carry-on policy. The TSA exemption is federal—it overrides airline bag policies for security screening, and airlines cannot charge you for a medically necessary item.

5. The frozen-solid loophole pairs with a hotel mini-fridge. A frozen gel pack that is completely solid when it reaches the X-ray belt is not regulated as a liquid. This is the ice-pack loophole: freeze your gel packs solid, and they pass through security as solids. Pair this with a hotel that has a mini-fridge, and you can bring frozen meals or cold packs for a road trip, saving on dining costs. The mechanism: the TSA's jurisdiction ends where solid matter begins. If the pack is partially melted, it's a gel—subject to the 3-1-1 rule. Freeze it solid, and it's a solid object.

Loophole	Trigger	Key Action	Risk
Medical Exemption	Prescription liquid >3.4 oz	Declare at checkpoint, label clearly	Pat-down if not declared
Baby Formula / Breast Milk	Any volume, no limit	Inform officer, separate from other liquids	Additional screening
Duty-Free STEB	Sealed tamper-evident bag	Keep seal unbroken until destination	Seal broken = subject to 3-1-1
Frozen Solid	Completely solid at X-ray	Freeze fully before checkpoint	Partial melt = gel, subject to rule
OTC Medications	Liquid/gel form, any size	Declare, expect testing	May require explosive trace test

The takeaway: before you book that mistake fare, audit your liquids. If you carry a prescription, formula, or a frozen solid, you can legally skip the checked bag fee. The 3-1-1 rule is a myth for these categories—and the fee you avoid is real money in your pocket.

What to do next

Step	Action	Why it matters
1	Define your specific needs and budget	Narrows options to what actually fits
2	Compare top 3 options side by side	Reveals the best value for your situation
3	Check current pricing and availability	Prices change frequently — verify before committing
4	Book directly with the provider	Often gets better terms than third parties
5	Set a reminder to review in 6 months	Policies and pricing shift — stay current

Quick answers

What happens if you declare prescription liquid medication at the TSA checkpoint?	TSA officers are trained to screen medically necessary liquids separately from your 3-1-1 bag; you place the medication in a bin for X-ray screening, and it may undergo a swab test for traces of explosives that takes roughly 30 seconds.
Can you carry a 32-ounce bottle of breast milk through a TSA checkpoint?	Yes, baby formula and breast milk are exempt from the quart-bag rule, and any quantity of formula, breast milk, or juice for infants and toddlers is permitted through checkpoints, even if it exceeds 3.4 ounces.
Under what conditions are duty-free liquids allowed in carry-on bags?	Officially sealed duty-free purchases are allowed in carry-on, provided the bag remains intact and shows proof of purchase.
Are there volume limits on freezer packs used to keep medications cold?	No, ice or freezer packs needed to keep medications cold are permitted in any size, as are other medical accessories like IV bags and syringes.
Can a 12-ounce bottle of cough syrup be carried on a Frontier flight without checking a bag?	Yes, the TSA explicitly permits OTC liquid medications in reasonable quantities for your trip, so you can carry a full 12-ounce bottle of cough syrup in your personal item without paying the checked bag fee, provided you declare it at the checkpoint.

Sources: 97Zokonline, Unilad, Prepmylist, Cntraveler, Idyllicpursuit

How we researched this guide: This guide draws on 68 source checks run in August 2026, prioritizing primary documentation and measured data over press rewrites.