One of the most widely used business envelopes, DL envelopes originated in 1920s Germany where they were known as DIN Lang. The term DL is now more commonly understood as an abbreviation of ‘dimension lengthwise’. With an International Standard size of 110mm x 220mm, or one-third the size of A4, DL envelopes are primarily used … Continue reading Window of Opportunity in DL Envelopes