According to the Department of Homeland Security, the TSA will be taking a closer look at thermoses during holiday travel. While the alert suggested a general threat, the TSA is taking the measure in light of concerns that insulated beverage containers could contain explosives for use in terror attacks.

The TSA has already banned liquids, according to the 3-1-1 rule, so the ban is intended to target empty thermoses. "Passengers traveling with insulated beverage containers can expect to see additional screening of these items using procedures currently in place, including X-ray screening, physical inspection and the use of explosives trace detection technology," the alert said. "This measure is designed to be sustainable. TSA will continuously review this measure to ensure the highest levels of security."

"As always, the safety and security of the American people is our highest priority and we ask the public to remain vigilant and aware of their surroundings and report any suspicious activity to their local authorities," the alert stated.