You can bring liquids in containers up to 3.4 ounces (100 ml) each , and all of them together must fit in one quart‑size clear bag in your carry- on.

How Many Oz Can You Bring in a Carry-On?

The Core TSA 3-1-1 Rule

For flights departing within or to the U.S., the standard liquid rule is:

  • Maximum per container: 3.4 oz (100 ml) of liquids, gels, creams, pastes, or aerosols.
  • Bag size: All containers must fit in one clear, resealable quart-size bag.
  • Per person: One quart bag per traveler in your carry-on.
  • Container size matters: A 4 oz bottle is not allowed in carry-on even if it’s only half full; the bottle itself must be 3.4 oz or smaller.

A common practical estimate is you can fit about 7–8 travel bottles of around 3 oz each into that quart bag (roughly 25 fl oz total), as long as it still seals.

What These “Ounces” Apply To

These rules cover items like:

  • Shampoo, conditioner, body wash
  • Lotions, sunscreens, liquid makeup, mascara
  • Toothpaste, gels, creams, hair gel, hair spray
  • Liquid food like yogurt, sauces, peanut butter, etc. (TSA treats many of these as liquids or gels)

Not restricted by the 3.4 oz rule (though still screened):

  • Solid foods (like sandwiches, chips, most solid snacks)
  • Solid toiletries (bar soap, solid shampoo bars, some deodorant sticks)
  • Most clothing, electronics, books, etc.

Are There Exceptions?

Yes, there are important carve-outs:

  • Medications: Reasonable quantities of medically necessary liquids can exceed 3.4 oz, but you must declare them and separate them for screening. (Policies can vary slightly by airport; always check just before you fly.)
  • Baby items: Formula, breast milk, and baby food can exceed 3.4 oz, again with separate screening.
  • Duty‑free liquids: Items bought after security (like large bottles of perfume or alcohol) are generally allowed in the cabin if they remain in their secure, tamper‑evident packaging.

Story-Like Example: Packing Night-Before-Flight

Imagine you’re packing for an early morning flight:

  1. You lay out full-size bottles: 12 oz shampoo, 8 oz conditioner, 6 oz body lotion.

  2. You realize none of them can go in your carry-on, so you pump each into 3 oz travel-sized containers.

  3. You place:

    • 1 travel shampoo
    • 1 travel conditioner
    • 1 small toothpaste
    • 1 mini hair gel
    • 1 small face wash
    • 1 travel-size sunscreen
    • 1 mini perfume spray
      all into a single quart-size zip bag , making sure it zips closed.

  4. Your larger originals go in checked luggage, but your essentials stay in your backpack and breeze through security under the 3-1-1 rule.

Forum-Style Takes & “Latest” Talk

If you browse travel forums and recent blogs in 2025–2026, discussions around “how many oz can you bring in a carry on” usually focus on a few themes:

  • People confirming the 3.4 oz / 100 ml limit is still being enforced at U.S. airports, despite talk in Europe about relaxing liquid rules with new scanners.
  • Frequent flyers noting that security agents increasingly pay attention to container size , not how full it looks—so that “almost empty” 4 oz bottle still gets pulled.
  • Travelers comparing how many small bottles they can realistically squeeze into a quart bag, with many quoting around 7–8 small containers before it becomes hard to seal.
  • Guides updated for 2025–2026 stressing that while carry-on size and weight rules are becoming stricter, the TSA liquid limit itself remains the same for now.

“I had to toss my fancy 4 oz face cream even though it was half empty. They didn’t care that it wasn’t full—only that the jar was over 3.4 oz.”
— Typical complaint in recent travel blog comments and forum posts

Quick Checklist Before You Fly

Use this as a simple mental checklist:

  1. Are all liquid containers 3.4 oz (100 ml) or less?
  2. Do all liquids fit in one quart-size clear bag that fully seals?
  3. Are larger bottles moved to checked luggage instead?
  4. Have you separated meds and baby items and prepared to declare them?

If you can answer “yes” to those, you’re usually set for TSA with your carry- on liquids. TL;DR:
You’re allowed liquid containers up to 3.4 oz (100 ml) each , and everything liquid/gels/creams/pastes must fit together in one quart-size clear bag in your carry-on, which usually works out to roughly 7–8 small bottles total.

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