post bag: courier bag,material:ldpe+hdpe,barrier Size:70mic*30*40cm selfadhesive,with destructiveness for one time. post bag:courier bag, express bag,mailer bag,various with good quality and reasonable price.courier bag,material:ldpe+hdpe,barrierSize:70mic*30*40cmselfadhesive,with destructiveness for one time.We mainly product PE/PO/OPP bags,self adhesive bags,envelope bags,chunk bags,air bubble ...