MSR Fuel Bottles are made from a single piece of impact-extruded aluminum to prevent leaks and cracks. The bottles are designed with thicker aluminum at the bottle's base and shoulders to resist bulging when pressurized. An air-tight seal allows fuel to be stored longer by preventing air from entering and degrading fuel. The bolstered shoulder and base to resist bulging when pressurized. The MSR Fuel Bottles are designed to work with the threaded pumps on your existing MSR stoves. Get fresh MSR Fuel Bottles and be ready for any outdoor adventure.