Rumor has it that liquid limits for carry-on luggage on planes are going to change, and they might -- but not until 2040.

The current rule set by the Transportation Security Administration (TSA) allows for travel-sized containers that are 3.4oz (100ml) or less of liquids, gels or aerosols.

Also known as the "3-1-1" rule, the limits date back to 2006 when terrorists in the UK attempted to smuggle liquid explosives onto planes. The restriction was only meant to be temporary, but it still remains nearly 20 years later.