The Paper Pouch IS handy little storage solution. While they can be bought, they can also be easily be made at home. Paper bags are an eco-friendly option, which is certainly something people need more of. The valve is a device to close and open a passage. Engine valves are devices that are used in internal combustion engines to allow or stop the flow of fluid or gas from cylinders or combustion chambers during the engine while the engine is operating. The pouch material does not work with specific sterilization methods. Do not overload the machine. The paper pouch is made available by us in various types as per the need. They are easy to install.