Toughness Test Pull hard, not easy to break Focus Ls More Professional Through the selection of high-quality new materials and processtechnology improvement and upgrading. Zoom In On The Details Smooth surface, no particle sense, good gloss,therebyreducing friction damage. The Production Workshop Packing & Shipping Advantages : Sturdy & Durable Construction: Our plastic mailing envelopes are made with premium-grade virgin Polyethylene plastic which are tear-resistant, puncture-resistant and waterproof. And every mailer is equipped with tamper-proof strong self-sealing adhesive strips.You can rely on our postal bags to withstand various factors and ensure that your package is safe before it reaches its destination. Convenient & Economical: The packaging bags can be sealed within a few seconds by peeling and exposing the glue, without the need for packing tape and pulse sealing machine. Plastic custom mailing bags are a great alternative to bulky and expensive shipping boxes.Mailing envelopes are light-weight and space-saving, which can help you save on postage and shipping costs. Widely Use: Multipurpose envelopes are great for shipping light and less fragile products, such as clothing，books, jewelry, accessories,etc; professional packing to protect your item.Perfect for online retailers,clothing boutiques,office-supplies,family,stores,crafts,schools and warehouse. 2.New formula white express bagRaw material: new formula PEmaterialThickness: normal, thickened Surface: Smooth Color. white matte Specification (W xL + Sealing):17X25+4cm, 20X28+4cm, .25X34+5cm.28X36+4cm.32x40+4cm.38x46+4cm, 42X50+4cm, 45X55+4cm 3.Economy grey express bagRaw material: primary recycled materialThickness: normal, thickened Surface: Smooth Color: matte grey Specification (Wx L+ Sealing): 17X25+4cm, 20X28+4cm, 25X34+5cm.28x36+4cm. 32x40+4cm. 38x46+4cm, 42×50+4cm.45X55+4cm.47x58+4cm, 55x65+4cm.60x80+5cm Can be customizedThick express bag with new materialRaw material: new PE material Thickness: thickened Surface: smoothColor: white light Specification (W x L + Sealing):17X25+4cm, 20X28+4cm, 25X34+5cm.28X37+5cm.32X40+4cm.38x47+5cm, 42×50+4cm, 45X55+4cm.47x58+4cm, 55x65+4cm.60x80+5cm