Product Description: 1.This bag is for packaging the 250g~1kg coffee beans or coffee powders. 2. With the excellent printing quality, there is an aluminum layer laminated, which is a very good barrier to resist moisture, oxygen, light etc. With this structure the bag can protect the inside coffee from the sunlight or air to avoid flavor emitting or acidification. 3. We can weld the one-way degassing valve according to your requirement. The valve is imported from PBI in USA. The one-way valve can let out the CO2 emitted from the coffee, while prevent the outside light and air, to protect the fresh flavor of the coffee. Besides when the customer is buying the coffee, they can squeeze the bag from this valve to smell the flavor. http://www.printstandupbag.com