You can carry liquids in containers up to 3.4 ounces (100 milliliters) each, and all of them together must fit inside a single quart‑size clear zip‑top bag in your carry‑on.

Quick Scoop

When people ask “how many oz can you carry on a plane,” they’re usually talking about the liquid rules for carry‑on bags, not checked luggage.

The core rule (TSA 3‑1‑1)

  • Each container : Maximum 3.4 oz (100 ml).
  • Bag limit: All your liquids, gels, aerosols, creams, and pastes must fit in one quart‑size (about 1 liter) clear, resealable plastic bag.
  • Number of bottles: Typically around 7–8 travel bottles of 3–3.4 oz, depending on shape and how tightly you pack them.
  • Total liquid volume in that bag is roughly 25 fl oz in practice, but the rule is about container size and bag size , not a precise ounce total.

If you try to cram in more so the bag won’t close properly, security can ask you to remove or throw away extras.

What counts as a “liquid”

All of these follow the 3.4‑oz‑in‑one‑bag rule in your carry‑on:

  • Shampoo, conditioner, body wash
  • Lotions and creams
  • Liquid makeup (foundation, liquid blush), mascara, lip gloss
  • Toothpaste and gels
  • Aerosol sprays (like hair spray or spray deodorant, within normal consumer sizes)

Checked bags are much more flexible: regular full‑size bottles are generally fine there, as long as they comply with airline and hazardous‑materials rules.

Exceptions and special cases

Some items can exceed 3.4 oz in your carry‑on if you declare them and follow the procedures:

  • Medically necessary liquids (prescription meds, some over‑the‑counter solutions)
  • Baby formula, breast milk, and baby food when traveling with an infant
  • Duty‑free liquids bought after security, in tamper‑evident bags

These do not go in your regular quart bag but may be screened separately.

Simple packing example

Imagine you’re packing for a weekend trip:

  1. You grab eight 3‑oz travel bottles: shampoo, conditioner, body wash, face wash, lotion, hair product, sunscreen, and liquid makeup.
  1. You put all eight into one quart‑size clear zip‑top bag; it zips easily.
  1. That’s acceptable at security: each bottle is under 3.4 oz, and all fit in a single quart bag.

If you added several more bottles so the bag bulges and won’t close, an officer might have you toss or move some into checked baggage.

Mini FAQ

  • Can I bring a 4‑oz bottle that’s only half full?
    No; the container itself must be 3.4 oz (100 ml) or smaller, regardless of how much is inside.
  • Is there a limit on how many 3.4‑oz bottles I can bring?
    Only that they all must fit comfortably in your single quart‑size bag.
  • Does this apply worldwide?
    Many countries use similar rules, but details can vary; always double‑check your departure airport’s security guidelines.

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