Designed for use with MSR Stoves as both pressure vessels & storage containers. Impact extruded from a single piece of Aluminum which means no seams or welds, these bottles are thicker at the corners & shoulders to avoid bulging under pressure. Leaks are prevented by machining the threads right into the neck of the bottle, instead of using a separate threaded metal insert. The pump can be stored inside a depressurised bottle for easy transportation.