... 1-22L of liquid, can assemble kinds of valves.2)Optional Accessorial Technique: assemble valves.3)Material Structure: PE ... packaging bags (snack, nut, dry fruit, seafood & candy, etc. )2)Coffee & Tea packaging bags)3)medicine packagingpouch4)Laminating film rolls ... film, heat sealed ,could be stand up. 2) Soft, nonpoisonous, beautiful and practical,convenient.The stand up bag is convenient and widely ...