Vending machines
You won't believe how many vending machines there are in Japan. They sell mostly drinks (but I also saw cigarettes). The drinks are both cold and hot; on cold days, hot milk and tea was the best treat ever. Most of the cans are really high quality and you cannot squeeze them with your hands. Pepsi and Coca Cola come in bottles made of aluminum and they are closeable. The western 33cl (16oz) seem to be too big for Japanese, that use mostly 22cl for sodas (but milk-tea and green tea can be a pretty big size, too).