big woven bag is make of pp woven matraial ... ect.Layer2-5layers, can addpo\pe\kraft paper bag inner for packing powder product.gram70-80g\sqPackaging ... kindPaper plastic bag, multi-layer bag, paste bottom bags(valve port bag), woven bags and kraft packaging bag ,PP woven ... sacks, aluminum foil bag,etc.Paper bag\valve paper bag\ fertilizer sack\big woven bag:1, shock ...