"Excuse me, can I sit there please?" whilst starting to make your preparations to sit where the offending bag is, pointing at it and smiling hard into their eyes.
Always works for me.
Also I have grey hair and I'm not afraid to use it.
@brokenbetty started
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"Excuse me, can I sit there please?" whilst starting to make your preparations to sit where the offending bag is, pointing at it and smiling hard into their eyes.