You can bring liquids in containers up to 3.4 fluid ounces (100 ml) each in your carry‑on, and all of them together must fit in one quart‑size clear bag under TSA’s “3-1-1” rule.

Quick Scoop: how many fluid oz on a plane?

For typical flights (especially from or within the U.S. and many other countries using similar rules):

  • Maximum per container in carry‑on: 3.4 fl oz / 100 ml.
  • All containers must fit comfortably in one clear, resealable quart‑size (about 1 liter) bag.
  • You can have several small bottles (shampoo, lotion, perfume, etc.) as long as:
    • Each one is 3.4 fl oz or less , and
    • They all fit inside that single quart bag and it can still close.

In practice, that usually means around 7–8 travel‑size bottles if they’re close to 3 oz each, before the bag gets too full to seal.

Mini breakdown: what counts as a “liquid”?

These rules apply to:

  • Liquids (water, juice, soda, etc.).
  • Gels (hair gel, some deodorants).
  • Creams and lotions (moisturizer, sunscreen, makeup).
  • Pastes (toothpaste).
  • Aerosols (sprays like deodorant or hair spray) in small containers.

All of these must follow the 3.4 fl oz max per container + 1 quart bag rule in carry‑on.

Exceptions and checked baggage

There are important exceptions where you can exceed 3.4 fl oz in carry‑on, generally if you declare them at security:

  • Medications and some medical liquids (e.g., certain solutions or special dietary liquids).
  • Baby formula, breast milk, and baby food when traveling with an infant.

For checked bags , the 3.4 fl oz limit normally does not apply , but:

  • Airlines and safety rules still limit hazardous liquids (like flammable items or strong chemicals).
  • Large bottles of shampoo, full‑size toiletries, and drinks can usually go in checked baggage, subject to those safety restrictions.

Simple example: packing for a trip

Imagine you’re packing carry‑on only and want:

  • 1 travel shampoo (3 oz)
  • 1 conditioner (3 oz)
  • 1 body wash (3 oz)
  • 1 face wash (2 oz)
  • 1 toothpaste (1 oz)
  • 1 small lotion (2 oz)

Each container is under 3.4 fl oz , so as long as all six fit in one quart‑size clear bag and it closes easily, you’re good.

Key points to remember (TL;DR)

  • Per bottle in carry‑on: up to 3.4 fluid ounces / 100 ml.
  • Bag rule: everything liquid must fit in one quart‑size clear zip‑top bag.
  • Checked bag: larger bottles usually okay (within airline safety rules).
  • Exceptions: baby items and medically necessary liquids can exceed 3.4 fl oz if properly declared.

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