... ,good security,handy use. 2,Good Quality Courier bag 3,mailing usage 4,mail,courier bags 5,Courier use Introductions ... :Mailing bags, also named Mailing envelopes courier bags,experess bags,mailing bag.1.Material:LDPE.2.Film ... was provided for reference.when you want to purchase the mailing bag,please provide these informations at below:1,size: width ...