You'd be surprised at the stuff I have to carry in that bag - Latest memo's from management. Emergency tickets (Ticket machine fails to work). Camera (to take photo if you have an accident). Spit kit (If someone spits at you so you can gather their DNA).Latest timetable book. My cash tray, phone, bottle of water,winter gloves, hat, spare ticket machine rolls, sunglasses, paper roll to clean mirrors! Then when you are going back to depot with a cash tray full of coins it can weigh very heavy!