... Seal Poly Mailing Bag 2-3 layers film, varied color printing, strong selfadhesive flap, good strengthen and OEM is welcomed ... express bags sprayed with serial code and three-side-sealed express bags etc available; 3)Customers' printing designs or logos available ... packing, shopping, garment, and so on. Strict quality control, with ISO9001 certification, can provide SGS certification for raw materials