Coffee bag is a bag type specially designed to hold coffee bag coffee powder, which is mainly composed of these materials: MOPP/OPP+VPET/AL+PE, it can be installed a one-way valve according to needs. The zipper of this bag is usually a kind of easy-to-tear zipper with tab, the bag needs to be heat-sealed after filling. When the user needs to take coffee, the zipper can be torn from tab and become reclosable situation.