How often you use an envelope that is not for work (those professional envelope with tiny address window)? I have a few friends we still keep our little letter writing tradition going, and often the whole envelope decoration becomes a competition when they send you shocking colors envelope with customize drawing/ writing on it. That’s why I have begin to make my own envelope. Being a person of symmetry, it often drives me crazy when the folding are asymmetrical! Present & Correct has totally save some lives here with this tool.