How Much Is Travel Size Liquid (2026 Data)

"Travel size" is not a marketing phrase. At US airport checkpoints it is a legal size: a container of 3.4 ounces¹ (100 ml) or less, packed with the others in one quart-size bag. Canada, the UK and the EU use the same 100 ml number for their standard rule.^{2 3} Yet the bottle that fits the rule is rarely a bargain: on one store shelf, a mini mouthwash cost 3.01 times⁴ as much per ounce as the 1-liter bottle of the same product.

The rule touches almost everyone who flies. US checkpoints screened 906.7 million⁵ people in 2025, and a bottle one size too big ends up in the bin. Below: the exact limits and exemptions, what travel sizes cost on the shelf today, how toiletry prices in general moved over 90 years, why some European airports now take 2-liter bottles, what a travel CPAP machine costs ($769⁶ to $919⁷), and why compression stockings cut silent clots on long flights from 47 cases to 3 in trials.⁸

Travel-size liquid: 3.4 ounces in one quart bag

The US rule has three parts. Each container of liquid, aerosol, gel, cream or paste holds 3.4 ounces¹ or less; all of those containers fit in one quart-size bag; and each passenger brings one bag in the carry-on. Anything larger goes in checked baggage, and an item that sets off an alarm gets additional screening.¹

The limit is the size of the container, not the amount inside it. A 100 ml bottle holds 3.38⁴ US fluid ounces, which the rule rounds to 3.4, and a US quart is about 946⁴ ml. A half-empty 5-ounce bottle is still a 5-ounce container. The UK says it outright: the limit still applies if the container is only part full.³

Other countries use the same container size with a slightly different bag. Canada allows 100 ml or 100 g per container in one clear resealable bag of 1 L² or less, one per passenger. The UK asks for a single transparent bag of no more than 1 liter³, about 20 cm by 20 cm, where a bag is required at all.

What is exempt

Some liquids may be larger than the limit and stay out of the quart bag. Liquid medication is allowed in "reasonable quantities" above 3.4 ounces; tell the officer at the checkpoint.¹¹ Formula, breast milk, juice for toddlers and baby food are allowed in larger amounts too, and do not have to go in the bag.¹² Duty-free liquids over the limit can travel in the carry-on for travelers connecting in the US from abroad if they are in a secure, tamper-evident bag and were bought within the last 48 hours¹.

Canada exempts baby food and drink for infants under 24 months², breast milk, and prescription and essential non-prescription medicine, and lets duty-free liquids through in a sealed official security bag with an itemized receipt for up to 48 hours¹³ after purchase. The UK lets travelers carry up to 2 liters³ of liquid for essential medical purposes, special dietary needs, baby food or baby milk at every airport.

Where bigger bottles go

Checked bags have their own federal limits for toiletries, perfume and aerosols: at most 17 fl oz¹⁴ (500 ml) per container and 68 fl oz¹⁴ (2 L) per person in total. Alcohol between 24% and 70% alcohol by volume may go in checked bags in unopened retail packaging, up to 1.3 gallons¹⁴ (5 L) per person; drinks over 70%, above 140 proof, are not allowed at all.¹⁵

Abroad, a carry-on bottle can grow twentyfold, but only at some airports.

In the EU the standard rule is still 100 ml per container in one 1-liter bag. Airports that run the new CT (computed tomography) scanners may now let passengers carry single containers of up to 2 liters, and most airports have not made the change yet; an EU-wide end to the 100 ml rule was still only planned in early 2026.⁹ Munich Airport, for example, dropped the 100 ml rule at all of its security checkpoints from September 18, 2026, after converting them to CT screening; containers over 2 liters still go in checked bags, and liquids and laptops can stay in the carry-on.¹⁰ It is not the first change: in September 2024 the EU had pushed airports with this equipment back to 100 ml over a technical problem,¹⁶ and in July 2025 it lifted that restriction again for airports whose scanners had been recertified, which is why CT lanes can take 2-liter containers now.¹⁷ The UK also says some airports allow up to 2 liters.³ In the US the rule stays at 3.4 ounces, so a 2-liter bottle carried through a CT lane in Europe has to go in the checked bag on any flight that leaves from a US airport.

How much is a travel size at the store?

Mostly less than two dollars. On one major US retailer's travel aisle on September 25, 2026, the 16 travel-size toiletries with a printed unit price cost between $1.49¹⁸ and $6.29¹⁸ each, and 10 of the 16 cost $1.99 or less.¹⁸ These are shelf list prices on one day, before tax and coupons.

The price per ounce tells a different story. It ran from $0.59¹⁸ for a travel shampoo and conditioner to $3.78¹⁸ for a half-ounce mini deodorant, a 6.41-fold⁴ spread. On this shelf the half-ounce sticks and the ointment cost the most per ounce, and the 3-ounce bottles of shampoo, conditioner and mouthwash the least.¹⁸

The travel-size markup

Four products sold in the same version at two sizes on the same day show the premium directly. The travel mouthwash is the extreme case: $0.62⁴ per fluid ounce for the 3.2-ounce bottle against $0.21⁴ for the 1-liter bottle, or 3.01 times⁴ as much per ounce. The markup is much smaller where the full size is not huge. The travel shampoos cost about 19%⁴ and 14%⁴ more per ounce than their 12.5- and 13.5-ounce bottles, and the deodorant dry spray only about 9%⁴ more than the full-size can.

A fifth pair, the Dove Advanced Care antiperspirant stick, is left out: the mini and the full-size stick list different strengths of the active ingredient, so they are not the same version.

The mouthwash shows why. The same product came in five sizes, and the price per ounce fell at every step up: $0.47²⁷ for 250 ml, $0.30²⁸ for 500 ml and $0.16²⁹ for 1.5 liters. A traveler who decants from the biggest bottle into a reusable 3-ounce bottle pays a fraction of the travel-size price for the same liquid.^{20 19}

What a Colgate Total travel size costs

The 1.4-ounce travel tube costs $1.99³⁰, or $1.42³⁰ per ounce. It has no same-version full-size tube to compare with: the full-size Colgate Total tubes on the same shelf that day were other versions with a different ingredient list, so a per-ounce premium would compare two formulas, not two sizes. Among travel toothpastes on the same shelf, it is the dearest per ounce, above a 2.7-ounce Crest + Scope tube at $1.03¹⁸ and a 1.9-ounce Colgate MaxFresh tube at $0.78¹⁸.

The shelf prices above are one day's snapshot. No series tracks travel-size prices over time, but the price index for toiletries of every size goes back 90 years.

Toiletry prices over 90 years

The consumer price index for personal care products covers toothpaste, shampoo, razors, cosmetics and the like in all sizes, not travel sizes alone. It stood at 22³¹ in 1935 and 180.039³¹ in 2025 (1982-84 = 100), 8.18 times⁴ higher. For almost two decades it barely moved: 153.5³¹ in 2003, 159.711³¹ in 2021. Then it jumped, and 2025 ended 12.0%⁴ above 2019.

That is still less than the 25.9%⁴ rise in consumer prices overall over the same six years. The index says how toiletry prices moved in general; the travel-size premium above is a separate, same-day comparison of one product at two sizes.

The index reached a record 185.707³¹ in August 2026, the highest monthly value in the series.³¹ A straight line fitted to 1980-2025 rises 1.69⁴ points a year and gives about 184.2⁴ for 2026, so the August value sits slightly above the line. Fitted to 2000-2025 only, the rate is 0.76⁴ points a year, less than half, because the index barely moved from 2003 to 2021; that shorter line ends below the level the index has already reached, so the chart uses the 1980 start. Both are our calculation, not a forecast.

Hair, dental and shaving products: flat for over two decades, then a jump

The group that holds toothpaste, shampoo, razors and other hair and dental products moved even less for a generation. Its index was 100.7³¹ in 1998 and 103.822³¹ in 2021 (December 1997 = 100), then rose 17%⁴ from 2021 to 2024 and reached 122.974³¹ in 2025. In August 2026 it stood at 126.652³¹, 3.1%⁴ above a year earlier.

No trend line fits this series. It is a flat line followed by a step: every straight line fitted to a long stretch of it lands below the level already reached in 2026, and a line fitted only to the last few years would simply extend the 2022-2024 jump for another 25 years. The table shows the yearly values without a projection.

Cosmetics, perfume and bath products

Cosmetics, perfume and bath products tell the opposite story: a long rise from 69.7³¹ in 1978 to 190.322³¹ in 2025, but only 4.1%⁴ of it since 2019. In August 2026 the index was 196.741³¹, 2.8%⁴ above August 2025.

The trend line is fitted to 2000-2025, when the index rose 0.86⁴ points a year. A line fitted to 1990-2025 rises 1.58⁴ points a year, almost twice as fast, but it runs above every actual year since 2019 (about 198.4⁴ for 2025 against the actual 190.322³¹), so it does not describe the index today. The 2000-2025 line gives about 212.8⁴ for 2050; our calculation, not a forecast.

Which personal care and health prices rose fastest, 2019-2025

Among these consumer price categories, services rose fastest: personal care services rose 31.9%⁴ from 2019 to 2025, more than prices overall.³¹ Hair, dental and shaving products rose 19.4%⁴, nonprescription drugs 12.9%⁴, medical equipment and supplies 8.5%⁴ and cosmetics only 4.1%⁴.

The latest months

The 2026 figures so far keep the same order. By August 2026 personal care products were 2.9%⁴ dearer than a year earlier, against 3.4%⁴ for all items, while medical equipment and supplies were 2.3%⁴ cheaper. Data run to August 2026; October 2025 has no index (not published).

A CPAP is a prescription device, but it travels in the same carry-on.

How much is a travel CPAP machine

From $769⁶ to $1,149³² at list price in September 2026. The cheapest current model, the Transcend Micro Auto, costs $769 and weighs 0.48 lb⁶ (218 g⁴). The AirMini AutoSet costs $919⁷ with its bag, power supply and a filter but no mask or tubing, and needs a prescription.⁷ It weighs 300 g³³ (0.66 lb⁴), and its maker states that it meets the FAA requirements for all phases of air travel.³³ The Transcend Micro 510 was on sale for $829³² against its regular price, a $320⁴ discount.

Two travel models have left the market. The Z2 Auto, a 10.4-ounce³⁴ machine, is listed as discontinued in 2026, and the DreamStation Go was discontinued after a Class 1 recall that began in June 2021.³⁵ The makers describe all three current machines as approved or compliant for air travel, and earlier Transcend models were cleared as Class II CPAP devices.^{6 32 36}

What Medicare pays for a CPAP

Medicare does not buy a CPAP outright. It pays a supplier to rent the machine for 13 months³⁷, after which the patient owns it, and the patient pays 20%³⁷ of the approved amount after the Part B deductible.³⁷ A CPAP is a capped-rental item: in July 2026 the Medicare fee schedule amount for each of the first three rental months had a median of $50.90³⁸ across the contiguous states in non-rural areas, and from the fourth month it is 75%³⁸ of that, about $38.18⁴ a month.³⁸ Thirteen months add up to about $534.45⁴ (3 x $50.90 + 10 x $38.175), of which the patient's 20% share is about $106.89⁴. The Transcend Micro's list price is 1.44 times⁴ that total and the AirMini's 1.72 times⁴. In rural areas the fee for months 1-3 is higher, with a median of $97.02³⁸, 1.91 times⁴ the non-rural fee.

A decade of CPAP payment swings

The fee has swung hard. The monthly rental fee for months 1-3 was $106.87³⁹ in 2015 and $39.75⁴⁰ in 2017, a 62.8%⁴ cut. It stayed there through 2019, rose 68.2%⁴ to $66.86⁴¹ by 2023, then fell 28.0%⁴ to $48.12⁴² in 2024. In 2026 it is $50.90⁴³.

The trend line starts in 2017, the first year after the 2016 cut took full effect, so it follows the fee as it has been set since then. Fitted to 2017-2026, it rises about $1.78⁴ a year and reaches about $100⁴ a month by 2050. A line fitted to every year from 2013 would be dragged down by the 2016-2017 cut and fall to zero before 2040, which no fee can do. Both are our calculation, not a forecast.

The fee schedule amount for a full face mask followed the same path, from $176.04⁴⁴ in 2013 to $86.53⁴⁰ in 2017-2019 and $110.81⁴³ in 2026. Fitted from 2017 for the same reason, its line rises about $3.60⁴ a year to about $206⁴ by 2050; our calculation, not a forecast.

Masks, tubing and filters

Several parts around the machine have higher fee schedule amounts than a month of rent. The amount for a heated humidifier is $171.02³⁸, a full face mask $110.81³⁸ and a nasal mask $70.00³⁸, while a disposable filter is $2.60³⁸. Medicare pays 80% of each amount and the patient 20%.

CPAP payments by state

The monthly CPAP rental fee for months 1-3 is almost the same everywhere in the contiguous states: from $50.04³⁸ in DC, Delaware, Maryland, New Jersey, New York and Pennsylvania to $52.65³⁸ in Illinois, Indiana, Michigan, Ohio and Wisconsin. Alaska ($93.44³⁸) and Hawaii ($97.97³⁸) are the outliers; Hawaii's fee is 1.96 times⁴ the lowest contiguous one. These differences come from the Medicare fee schedule's locality adjustments. The map shows the Medicare fee schedule amount per month, not what travelers pay and not what travel costs in each state.

Medical equipment prices

Consumer prices of medical equipment and supplies rose less than most. The index was 99.077³¹ in 2010 (December 2009 = 100), dipped to 96.23³¹ in 2021 and reached 110.875³¹ in 2025, 8.5%⁴ above 2019. The series starts in 2010, and a straight line fitted to all of it falls below the 2025 level, so the table shows the years without a trend line.

A CPAP needs a prescription; compression socks sit on an open shelf. But how strong should they be?

How much compression you need in travel socks

Anyone traveling more than 4 hours⁵³, by air, car, bus or train, can be at risk of a blood clot, and some people may benefit from graduated compression stockings.⁵³ The risk is higher for people over 40, with obesity, after recent surgery or injury, on estrogen, during or after pregnancy, or with a previous clot.⁵³

The flight trials used mild to moderate pressure, measured at the ankle: 12-18⁵⁴, 14-17⁵⁴, 20-30⁵⁴ and 23-32⁵⁴ mmHg, mostly on flights of 7 to 12 hours.⁵⁴ None of the trials used more than 32 mmHg.

What the trials found

A pooled review of 12⁸ randomized trials with 2,918⁸ passengers on flights of more than five hours found that stockings cut symptomless deep vein thrombosis sharply. Of the 2,637⁸ passengers followed up in the 10⁸ trials of stockings on both legs, 50⁴ had a silent clot: 3⁸ wearing stockings and 47⁸ not, an odds ratio of 0.10⁸, rated high-certainty evidence. That is 1.9%⁴ of the passengers followed up. There were no deaths, lung clots or clots with symptoms in either group, and the stockings also reduced swelling of the legs.⁸ A second review of 8⁵⁴ trials, covering 2,022⁵⁴ passengers for clots and 1,311⁵⁴ for swelling on flights longer than three hours, reached the same direction of result.⁵⁴

Compression classes are not the same everywhere

A "class 1" stocking means different pressures in different countries: 14-17⁵⁵ mmHg under the British standard, 10-15⁵⁵ under the French and 18-21⁵⁵ under the German one. Compression up to 20 mmHg⁵⁵ can be used without an arterial check when there are no warning signs.⁵⁵ US Medicare codes group stockings into 18-30³⁸, 30-40³⁸ and 40-50 mmHg bands, so a British or French class 1 stocking sits below the lowest Medicare band.

What compression stockings cost Medicare

Medicare covers compression stockings for lymphedema treatment, a benefit that started in January 2024, not for travel. For a covered patient in July 2026 the Medicare fee schedule amount (the allowed payment) is $39.07³⁸ for a below-knee stocking of 18-30 mmHg and up to $138.21³⁸ for a waist-length stocking of 40 mmHg or more, 3.54 times⁴ as much. Of the below-knee amount, Medicare pays 80% ($31.26⁴) and the patient 20% ($7.81⁴). The below-knee amount was $36.93⁴² in 2024, so it has risen 5.8%⁴ in two years; the amounts are updated each year with consumer prices.

These are Medicare fee schedule amounts for patients, not shelf prices of travel socks.

How many travelers carry a quart bag

Every person who passes a US airport checkpoint may carry one quart bag. In 2025 that was a record 906.7 million⁵ people, 2.48 million⁴ a day and 2,667,399⁴ more than in 2024. The busiest day was November 30, 2025, with 3,134,613⁵ people, 2.01 times⁴ the quietest day, Thanksgiving Day itself, with 1,559,165⁵. On 8⁵ days of 2025 more than 3 million people were screened.

The count fell to 339.8 million⁵⁶ in 2020, 40.1%⁴ of the 2019 total of 848.1 million⁵⁷, and passed 2019 again in 2023. From January to August 2026, 602.6 million⁵⁸ people were screened, 0.63%⁴ fewer than in the same months of 2025.

Month by month

Summer is the peak. July 2025 was the busiest month, with 85.1 million⁵ people screened, 1.36 times⁴ February's 62.6 million⁵. 2026 has tracked 2025 closely, month by month.

What it means for your bag

The quart bag is a small part of any trip, but three things follow from the numbers on this page.

• Decanting pays. A 3.2-ounce travel mouthwash costs 3.01 times⁴ as much per ounce as the 1-liter bottle, so filling a reusable 3-ounce bottle from a big bottle at home costs far less per ounce.
• Mini deodorants and ointments cost the most per ounce. At $3.78¹⁸ an ounce, the half-ounce mini antiperspirant had the highest price per ounce of the 16 travel items on the shelf.¹⁸
• Medical gear flies separately. A CPAP machine is allowed in hand luggage and in the hold on UK flights and is screened separately, and liquid medicine may exceed 3.4 ounces in the US.^{63 11}

In Europe, check the departure airport: a 2-liter bottle allowed through a CT lane there still has to go in the checked bag on any flight that leaves from a US airport.

Conclusions

1. The size is global, the price per ounce is not. The same 100 ml limit applies in the US, Canada and most EU airports and many UK airports, but the travel bottle costs up to 3.01 times as much per ounce as the big bottle of the same product.^{1 4}
2. Toiletry prices rose less than prices overall. The price index for personal care products of all sizes rose 12.0% from 2019 to 2025, against 25.9% for all prices. The travel-size premium is a separate, same-day comparison of one product at two sizes.³¹
3. A travel CPAP costs more than Medicare's full rental. The $769 to $919 list prices are 1.44 to 1.72 times the about $534.45 that 13 months of Medicare rental fees for a CPAP device add up to (months 4-13 are paid at 75% of the fee for months 1-3).^{6 7 38 4}
4. Mild to moderate stockings did the work in trials. The flight trials used 12-32 mmHg at the ankle; pooled trials cut silent clots from 47 to 3. Medicare's lowest stocking band starts at 18 mmHg.^{54 8 38}
5. The 2-liter bottle is a European exception, not a new rule. It depends on the airport's CT lanes, and the US limit stays at 3.4 ounces.^{9 10}