... ,mailing usage 4,mail,courier bags 5,Courier use Introductions:Mailing bags, also named Mailing envelopes courier bags,experess bags,mailing bag.1.Material ... 2,the common specification bags 3,Has the column for write adress bags 4,no printing bag 5,bubble lining mail bag 6 ... ,single color bags 7,aluminium foil bag ...