... envelopes courier bags,experess bags,mailing bag.1.Material:LDPE.2.Film Colour: outside-white & inside-black.TIANBAI PLASTIC3. ... permanent adhesive tape on lip(4-5cm) to seal(2-10mm) bag after packing.5.Printing: 1-10 ... mail things Standard Sizes:1, 6" x 9"2, 71/2" x 101/2"3, 9" x 12"4, 10" x ... About the raw material,We can provide SGS certificate.2)Price: We have lower labor cost,we have the channel ...