While travelers can bring many food items through security checkpoints, the Transportation Security Administration’s liquid ...

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Liquid and Gel Restrictions. The TSA's "3-1-1" rule limits liquids, gels, and aerosols to containers of 3.4 ounces (100 milliliters) or less, which must fit in a single quart-sized, clear plastic bag.

TSA declares peanut butter a liquid, prompting travelers to rethink what snacks can and can't pass through in their carry-ons. ... Another snack added to that list is cheese dip.

TSA said while people "may not be nuts about it," only 3.4-ounces of peanut butter are permitted in carry-ons. ... You don’t want it to become all chips and no dip.

"You may not be nuts about it, but TSA considers your PB a liquid." - - TSA. TSA continued, saying that if the peanut butter's container is larger than 3.4 ounces, it must be stored in a carry-on bag.

The TSA requires "any item you can spread, smear, spray or spill" to be 3.4 oz or less if in a carry-on, and all the liquids a passenger is traveling with must fit in a quart-size bag.