Fuel cartridge of a fuel cell with fuel stored outside fuel liner

A fuel supply connectable to a fuel cell is disclosed. The fuel supply comprises an outer casing having a smooth inner surface, and an inner fuel container containing a fuel for the fuel cell and having a smooth outer surface, wherein the inner fuel container when substantially fully inflated comes into contact with the outer casing and decreases the permeation rate of gas to the inner fuel container, wherein the outer casing has a top end fixedly attached thereto, and a protruding member disposed on a top end of the outer casing to increase the difficulty to the top end being separated from the outer casing