I'm sure if I looked I would find some discussions on this but what makes me laugh is the 3oz versus 100ml between the US and Europe. Only a small difference, but my deodorant is below the 100ml limit but over the 3oz limit.
TSA website:
The rule limits the volume of liquids, gels and aerosols to bottles 3 ounces or smaller (or 100 ml), in 1 quart-sized zip top bag
Problem is:
3oz=89ml and 100ml=3.38oz
1qt=.94l and 1l=1.05qt