... a bundle. surface packing with woven material, whterproff and endure dirty.Colorbleached kraft\brown kraft\white kraftPrintingOffset printing ... , milk powder, food, feed additives, nanometer material and new building materials industry packaging.Bottom kindValve port\sealing bottom ... plastic bag, multi-layer bag, paste bottom bags(valve port bag), woven bags and kraft packaging bag ,PP woven sacks, ...