On a flight a week ago and unusually for me I was taking liquids, most time buy when I arrive and dispose of what not needed when leaving.
On this occasion the plastic bag i had them in I was told wasn't sufficient, it was clear and I tied a knot in it, said I must buy the airport ones otherwise he would bin the items.
I asked for a copy of regs stating size of bag and must be airport specific, he put bag through then opened it, got a bag he deemed acceptable, asked me to transfer to it, seal it and then put it through again...............