Environmental protection. The inner aluminized cowhide bag is made of composite material or pure kraft paper, which is non-toxic, tasteless and pollution-free, conforms to the national environmental protection standards, and has high strength and belongs to high environmental protection. It can be recycled at 100%, even if it is discarded, it will decompose quickly and will not pollute the environment. Woking one-way exhaust valve coffee kraft paper bag is the most ideal way to store coffee bean powder. The product adopts "thick kraft paper+aluminum plating+plastic film" composite material, which is waterproof, oxygen-proof, shielding, moisture-proof, light-proof and puncture-proof.