You can usually bring liquids in containers up to 3.4 ounces (100 ml) each in your carry‑on, and they all must fit in a single quart‑size clear bag.

How Many Ounces Can You Bring on an Airplane?

Quick Scoop

If you’re flying from or within the U.S., the standard “3-1-1 rule” applies to carry‑on bags:

  • 3 : Liquids, gels, aerosols, creams, pastes in containers no larger than 3.4 oz (100 ml).
  • 1 : All those containers must fit in 1 quart‑size (≈1 liter) clear resealable bag.
  • 1 : You only get 1 such bag per passenger.

In practice, that usually works out to about 7–8 travel bottles of 3–3.4 oz, depending on their shape and whether the bag still closes easily.

Think of it like this: as many small bottles (3.4 oz or less) as you can zip into one sandwich‑bag‑sized clear pouch — and still close it.

What Counts as a “Liquid”

All of these follow the same carry‑on rule:

  • Liquids (water, juice, shampoo, etc.)
  • Gels (hair gel, aloe)
  • Aerosols (deodorant spray, hair spray)
  • Creams and lotions
  • Pastes (toothpaste, ointments)

If they’re over 3.4 oz , they must go in checked luggage , unless they’re one of the special exceptions below.

Exceptions to the 3.4 oz Rule

Some items can exceed 3.4 oz in your carry‑on (rules can vary slightly by country, but in the U.S.):

  • Medically necessary liquids (prescription meds, some OTC meds, certain medical solutions) – allowed in larger amounts, but you should declare them at security.
  • Baby formula, breast milk, and baby food – can exceed 3.4 oz when traveling with an infant; again, declare them.
  • Duty‑free liquids bought after security – larger bottles are OK when sealed in a tamper‑evident bag and with receipt for same‑day travel.

Always keep these separate from your regular 3‑1‑1 bag and be ready to show them to officers.

Are the Rules Changing?

Some airports (especially in parts of Europe and the UK) are starting to roll out new scanners that relax the 100 ml limit, sometimes allowing containers up to 2 liters and not requiring separate bagging. This is location‑specific , and in early 2026 the standard TSA rule in the U.S. is still 3.4 oz per container in a quart‑size bag for carry‑ons.

When you travel, it’s smart to:

  1. Check your departure airport’s security page.
  2. Check airline and national security agency guidance a few days before flying (rules can update).

Carry‑On vs. Checked: Ounces at a Glance

[1][3][5] [1][3][5] [7][3][5] [7][5] [5]
Bag type Container size limit Approx total you can bring Notes
Carry‑on (standard U.S. TSA) Max 3.4 oz (100 ml) per container As much as fits in 1 quart‑size bag (often ~25 fl oz total) Liquids, gels, aerosols, creams, pastes all included
Carry‑on (exceptions) More than 3.4 oz allowed for meds, baby items, some duty‑free “Reasonable quantities,” not a strict ounce cap Declare at security; may be screened separately
Checked baggage No per‑bottle rule for regular liquids; aerosol and hazardous items have separate rules Mostly limited by airline baggage weight rules Good place for full‑size toiletries and large drinks (if allowed)

Forum-Style Tip Roundup

From travel blogs and community advice, a few traveler‑tested hacks keep showing up:

  • Use refillable 3 oz bottles instead of buying lots of mini‑store sizes.
  • Pack solid versions when possible (bar shampoo, bar soap, solid deodorant) to save liquid space.
  • Keep your 3‑1‑1 bag easy to pull out at security to move faster.
  • If you tend to buy drinks at the airport, bring an empty water bottle and fill it after security.

“If it smears, sprays, spreads, or spills , treat it as a liquid and assume it needs to follow the 3‑1‑1 rule.”

Quick TL;DR

  • Max per container in carry‑on: 3.4 oz (100 ml).
  • All containers must fit in: 1 clear, quart‑size resealable bag, 1 bag per person.
  • Typical real‑world capacity: ~7–8 travel bottles, around 25 oz total.
  • Larger amounts: Put in checked bags, or rely on exceptions (meds, baby items, duty‑free).

Information gathered from public forums or data available on the internet and portrayed here.