Block Bottom Mailing Bag | Courier Bag Our co-extrusion White/Grey plastic Courier Bags (Envelope bags) are well known for being tear and puncture resistant as well as tamper proof. The bags are available in any Pantone colors and with printing up to 10 colors in either flexo or rotogravure printing. Block bottom side gusset mailing bags are ideal for shipping 3D packages such as shoes box and other bulkier items. Material: HDPE/ LDPE Size: 100 – 1,000mm Thickness: 0.03mm – 0.1mm Printing: Up to 8 color, Flexography or Rotogravure MOQ: 5,000 pcs Options: Oxo-degradable material options available. Compostable material options available.