Japan can package up all the snacks they want, they still use far less oil per capita than the USA.

Japan: Approximately 28% of all passenger kilometers are traveled by rail

United States: Rail travel accounts for only about 0.25% of passenger kilometers

Remember: when you drive your 30mpg car to work, 20 miles down the freeway, alone in your vehicle by yourself, you are burning over a gallon of refined petroleum product every single day. You can make a loooooot of plastic bags with that much oil.

Something like 95% of Americans get to work via automobile.