For about a year now these oxygen bottles have been for sale in 7-eleven in Japan.

They come in several choices such as melon, coffea or like the in the photo below, “forest”.

Exactly what to do with these bottles including how, when and why to use them remains unknown. But a competing convenience store chain has answered by offering oxygen-rich water on bottle.

via http://www.kimchikid.com/blog/2008/04/26/oxygen-gas-bottles-for-sale-in-7-eleven-in-japan/