You can usually bring liquids in containers up to 3.4 oz (100 ml) each in your carry-on, and they must all fit inside one quart-sized clear bag.

Quick Scoop: Basic Rule (TSA 3-1-1)

For flights following U.S.-style security rules (TSA and most international airports):

  • Each liquid/gel/aerosol container : max 3.4 oz (100 ml).
  • All containers must fit in one quart-sized (≈1 liter) clear, resealable plastic bag.
  • One bag per person in your carry-on.
  • Total you end up with is usually around 7–8 travel bottles and about 25 oz of liquid in that bag, depending on bottle shape.

This applies to things like shampoo, toothpaste, lotions, hair gel, and similar items.

Exceptions and Special Cases

  • Medications, baby formula, and some medical liquids can go above 3.4 oz in reasonable amounts, but you must declare them at security.
  • A 4 oz bottle is generally not allowed in carry-on , even if it’s half empty, because the container size itself must be 3.4 oz or less.
  • In your checked bag , liquid limits are much looser (airline and safety rules apply, but not the 3.4 oz rule).

Newer 2026 Changes at Some Airports

A few airports (for example some in the UK with new CT scanners like Heathrow and Gatwick) are starting to relax the 100 ml rule , allowing liquids up to around 2 liters per container in hand luggage when departing from those airports.

However, the traditional 3.4 oz (100 ml) / quart-bag rule still applies at most airports worldwide in early 2026, especially in the U.S.

Quick Example

If you’re packing a U.S. domestic flight today:

  • You can bring:
    • 1 x 3 oz shampoo
    • 1 x 3 oz conditioner
    • 1 x 3 oz lotion
    • 1 x 2 oz toothpaste
    • 3–4 other small items (like face wash, sanitizer)
  • As long as each is 3.4 oz or less and they all fit in one quart-sized clear bag, you’re fine.

Bottom note: Rules can vary slightly by country and airport, so always double-check your departure airport’s current security rules before you fly.

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