1K views | Why do we have a liquids rule? Liquid explosives still pose a threat. Allowing passengers to carry liquids, gels and aerosols in smaller containers lessens the risk. So here’s the 411 on our 3-1-1 liquids rule! Any item that you can pump, squeeze, spread, smear, spray or spill must be 3.4 ounces or less and fit comfortably in a single, quart-sized resealable bag along with your other travel-sized liquid items. | Transportation Security Administration - TSA | Facebook