Yes, the TSA still strictly enforces the 3-1-1 rule for liquids in carry-on luggage, which requires all liquids, gels, and aerosols to be in containers of 3.4 ounces (100ml) or less and fit into a single, clear, quart-sized bag. In 2026, despite the rollout of advanced CT scanners at many major airports that allow you to leave liquids inside your bag, the "one quart-sized bag" limit remains the legal standard for most travelers. If your liquids are loose in your bag or in multiple bags, you risk being pulled aside for a manual search. The only major exceptions are for TSA PreCheck members at specific checkpoints where "liquids-in" is permitted, or for "medically necessary" liquids and baby formula, which are exempt from the quart-size limit but must still be declared for inspection. For the standard traveler, using a high-quality, reusable quart-sized bag is the best way to ensure a seamless security experience.