FLYERS may not know that they could be slapped with fines if they accidentally bring a banned hair product onto a plane.

Travelers should double-check their favorite hair tools and make sure they don't violate a little-known Transportation Safety Administration rule before packing for a Labor Day vacation.

Savvy travelers may have already read the TSA's latest guidelines for hair straighteners and dryers that are powered by lithium batteries.

Under the newly imposed rules, the styling tools using the power banks must be in carry-ons and never in checked bags.

This is because lithium-ion batteries are at risk of spontaneously combusting in the cabin below, where the crew cannot reach them mid-flight.

However, travelers may not know that this isn't the first strict rule imposed o

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