"The TSA has strict guidelines on the quantity allowed rather than the type of liquid you can carry on a plane. It seems like the nature of the liquid isn't the issue; it's just the volume. In this case, you're more than welcome to bring soup with you, but like shampoo, soda, or honey, you can only bring 3.4 ounces of it. That works out to slightly under half a cup."
"A typical appetizer serving of soup is at least eight ounces, but a full meal portion could be anywhere from 12 ounces to 16 ounces. Look at most of the popular canned soup brands, and you'll notice many are about 14 ounces. So the TSA would let you bring about a quarter of a can. Keep your soup on the ground Punkbarby/Getty Images Less than half a cup is a perplexingly small amount of soup to want to bring with you anywhere."
TSA liquid rules limit liquids by quantity rather than type, so soup is treated like other liquids and is subject to the 3.4-ounce (100 ml) container limit. Passengers must place permitted containers in one quart-sized bag, with only one bag allowed per person under the 3-1-1 rule. Typical soup servings and most canned soups far exceed the 3.4-ounce allowance, making it impractical to bring a full serving through security. The size restriction aims to prevent transport of explosive liquids by keeping individual liquid volumes small, so buying soup after arrival is often the best option.
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