It's getting more and more crowded on the tube, and not because there are more passengers. It's because of bags. People never used to carry quite so many bags around with them, but now nearly everybody has at least one. Handbags, shoulder bags, carrier bags, gym bags, the list is almost endless. And what a lot of carriage space they take up. There you are trying to squeeze onto a train in the rush hour, but it's almost impossible to get on because a significant percentage of the carriage space is being taken up by bags. See that suited City bloke with a laptop bag in his hand and a holdall slung over his shoulder? Don't get too close or he'll squash you. Selfish space-hogger. See that secretary standing in the doorway with her cavernous handbag and three designer shopping bags? She may be thin herself, but these bags make her the spatial equivalent of an obese whopper. Selfish space-hogger. See that paint-stained workman with a chunky fat toolbox down on the floor where everyone keeps tripping over it? Nobody can get close to him. Selfish space-hogger. See that shaggy student type with a bulging rucksack drooping from his back? He's taking up double the space he would normally, because nobody can stand in the shadow of his artificial hunchback. Selfish space-hogger. This crowd and their excessive bag quotient are smugly clogging up the train, and there I am left standing on the platform as the doors close. Bags don't buy tickets, bags don't have a job to go to, but bags are travelling by tube in place of genuine passengers. If only a few more people would leave their carriers at home, more of the rest of us could be carried ourselves.