TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The outer casing and the inner liner are molded simultaneously. The fuel supply further comprises an intermediate layer disposed between the outer casing and the inner liner where the intermediate layer is incompatible with at least one of the outer casing or inner liner. At least one of the outer casing or inner liner is wrapped with a gas barrier film.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The outer casing and inner liner comprises hydrophilic filler, preferably talc or calcium carbonate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The slip agent comprises a long chain fatty acid amide, preferably oleamide or erucamide. The intermediate layer is made from a wax comprising paraffin wax, microcrystalline wax or synthetic wax.    TECHNOLOGY FOCUS - POLYMERS - Preferred Material: The outer casing and the inner liner are made from polymers that are incompatible to each other. The outer casing and inner liner comprises a polar resin and the other one of the outer casing and inner liner comprises a non-polar resin. The polar resins comprise acrylonitrile butadiene styrene, thermoplastic polyesters, polycarbonates, polyvinyl chloride, polyamides, polyarylene ethers, or thermoplastic polyurethanes. The thermoplastic polyesters comprise polyethylene terephthalate (PET). The polyamides comprise nylon, polysulfones or polyarylene sulfides. The polyarylene ethers comprise polyphenylene oxide, polyether ketones, polyetherether ketones, acetate, or acrylic-polyvinyl chloride copolymer. The non-polar resins comprise high density polyethylene (HDPE), polypropylene or polystyrene. The polymers comprise a thermoplastic elastomer. The thermoplastic elastomer comprises butyl rubber. The outer casing-and inner liner comprises polyethylene, and where the other one of the outer casing and inner liner comprises a slip agent. The gas barrier film comprises polyvinyl alcohol (PVOH), ethylene vinyl alcohol (EVOH), EVOH bonded to a polyester substrate, polyvinylidene chloride copolymers (PVDC or Saran), nylon resins, fluoropolymers, polyacrylonitrile (PAN), polyethylene naphthalate (PEN), poly(trimethylene terephthalate) (PTT), resorcinol copolymers, liquid crystal polymers, aliphatic polyketones (PK), or blends and copolymers of these materials.