The Stand Up Kraft Paper Zip Lock Bag is of excellent sealing performance, high barrier,oxygen permeability ultra low humidity, moisture and corrosion fouling of radiation, strong mechanical properties. The appearance is bright and practical. Non-toxic and odorless Kraft material meets national standards. Can be sealed prison again to prevent others from opening. You can install whole grains, red dates, wolfberry, dried fruit, herbs, medicines, all kinds of tea,etc.