London Transport

Why do people who carry bags on the Tube allways carry them so that they stick out behind them and poke in to the body, face or other body part of the unfornunate person behind them ?. In any case (pun !) wht do so many so called men, suddenly had to start carrying a rucksack or other such bag when in the past a Briefcase was sufficient ???????? THEY ALL MAKE ME SICK !