Short answer: not as much as you think, but enough to get through your routine.

The TSA liquids rule (aka the 3-1-1 rule) is what determines how many ounces you can bring on a plane in your carry-on.

What Is the TSA Liquids Rule?

The tsa liquids rule allows you to bring:

• 3.4 ounces (100 ml) or less per container
• All liquids must fit into one quart-sized clear bag
• One bag per passenger

So if you’re wondering how many fl oz can you bring on a plane, the answer is:
Each individual item must be 3.4 oz or less, not your total combined liquids.

This is the standard airline liquid limit for carry-on bags across most flights departing from the U.S.

What Counts as a Liquid?

It’s more than just water or drinks. The rule applies to anything spreadable or gel-like, including:

• Shampoo, conditioner, body wash
• Toothpaste
• Skincare (lotions, serums, sunscreen)
• Makeup like liquid foundation or gloss

If it can spill, squeeze, or smear, it likely falls under liquid requirements carry on guidelines.

Can You Bring More Liquids in Checked Luggage?

Yes. The airline liquid limit only applies to carry-ons.

In checked bags, you can pack full-size products without the 3.4 oz restriction. Just make sure everything is sealed well to avoid leaks mid-flight.

Quick Tips for Packing Liquids

• Use travel-size containers to stay within the 3.4 oz limit
• Keep your liquids bag accessible for security checks
• Pack smarter, not more—bring only what you’ll actually use
• Use a toiletry bag to keep everything contained and easy to find

Final Takeaway

If you’re wondering how many ounces you can bring on a plane, remember:
3.4 oz per item, all inside one quart-sized bag.

Stick to the TSA liquids rule, and getting through security is quick, easy, and drama-free.