The long and humid summers of Japan call for a lot of cold green tea. Rather than keep running to the store to buy fresh bottles, many in Japan prefer to make their own. These long tubes are much like normal tea bags, except much longer and thicker.
Simply fill a 2 Litre bottle with water, put one portion of green tea inside and close the lid on the top of the bag. After a few hours in the fridge, you have a large refreshing bottle of green tea to enjoy!