... is optional, PE or CPP/PET/AL, PE/VMPET/OPP, matte CPP/PET/OPP, PE/PET/OPP, CPP or PE/PET/BOPP, PE/PA, RCPP ... breakage, non leakage7. bag type: three-side seal bag(with zipper or not), side-gusset bag, central seal bag, stand-up bag(with zipper or ... /PET/PA/AL. And the bag can be plastic- plastic laminated packing bags , plastic -aluminum laminated packing bags , PE or PET laminated packing bags. ...