As with all things Japanese, they of course have miniature beer cans.
![small_beer2 Small beer can in Japan](http://www.lofton.net/wp-content/uploads/2011/08/small_beer2-201x300.jpg)
105¥ for 135ml, easy to carry in your pocket for those emergencies where you just need to have a beer
I am not sure who the target audience is for these little cans; Women, children, pocket-ninjas? I estimate it would take about 36 of these to begin to get drunk… well for me. For some of you hardier folks it would probably be more like 100.