The courier envelopes are basically the packing materials, usually used by the postmanfor deliver the letters, documentsas couriers to the correct person. The material quality is sturdy which makes it resistant to mild tear and damage. The envelopesare often sealed to make the message reach only to the referred person. The courier envelopes are made with the distinct kind of paper material, which protects the letters from getting torn. The demands of the envelopes are also in the business sector.