Carry-On Rules for Food and Drink

This page summarizes published TSA guidance. A screening officer has the final say on any item, international rules differ, and agricultural restrictions at your destination are a separate matter entirely. Sources are linked at the bottom.

The test: spreadable or pourable

There is no separate “food rule”. Food is governed by the liquids rule, and the liquids rule covers liquids, gels, aerosols, creams and pastes. So the only question is which side of that line an item falls on.

The pattern is consistent once you see it. Nobody is judging whether something is food; they are judging whether it behaves like a liquid at a checkpoint. The full 3-1-1 rule.

Water, and the bottle you should carry

A water bottle must be empty through the checkpoint, every time. It is then refillable airside, and that is the entire trick — the bottle passes, the water does not.

Worth noticing: the TSA quart bag is 0.95 L and a standard 32 oz bottle is also 0.95 L. That is a coincidence, and a useful one for remembering what a quart of volume actually looks like. Which bottle, and the arithmetic.

Drinks bought after security come aboard without restriction, which is why the coffee in your hand is fine and the one you brought from home is not.

Baby food is exempt, and it is generous

One of the largest exemptions in the whole rule. Baby formula, breast milk and baby food are permitted in reasonable quantities exceeding 3.4 oz, and they do not have to fit in the quart bag.

Two things about it that surprise people. It applies whether or not the child is traveling with you. And, like medically necessary liquids, the price of the exemption is a declaration at the start of screening rather than an explanation afterwards.

Powders, and the 12-ounce line

Less well known and increasingly enforced. Powder-like substances over roughly 12 oz or 350 ml in a carry-on may require additional screening and may need to be removed from the bag.

In practice this means protein powder, large containers of coffee, spices bought as gifts, and infant formula powder. None of it is prohibited — it is slower. If you are carrying a large quantity of anything powdered, put it where you can reach it.

The rule that actually costs people money

Everything above is about a checkpoint. The more expensive rule is at the other end: agricultural restrictions on arrival, which are enforced by customs rather than by security and carry real penalties.

• Fresh fruit, vegetables, meat, plants and seeds are restricted or prohibited on entry to many countries, the US and Australia among the stricter ones.
• The apple you did not eat is the classic case. It cleared security in one country and it is a declarable agricultural product in the next.
• Declare it, always. Declaring something that turns out to be prohibited costs you the item. Not declaring it can cost a great deal more.
• Domestic flights are usually fine, with genuine exceptions — Hawaii and some US territories restrict agricultural products from the mainland.

This is a customs question rather than a baggage one, and it is worth two minutes on the destination country’s own site before you pack food.

What to actually bring

• An empty bottle, filled after the checkpoint. Removes the dependence on a cart that comes round twice.
• Solid snacks — nuts, bars, dried fruit, a sandwich. No limit, no declaration, no argument.
• Something for a child, in reach rather than in a bin. This is the highest-value item on the list. The rest of the family cabin bag.
• Nothing that smells strongly in a sealed metal tube with two hundred people in it. Not a rule; a courtesy that everyone will thank you for.
• Nothing fresh that has to clear customs, unless you intend to eat it before landing.