- Carew Papritz, Continental Elementary School
- 455.61 square metre(s)
- United States (Green Valley)
The largest envelope measures 455.61 m² (4904.17 ft²), and was achieved by Carew Papritz and Continental Elementary School (both USA) in Green Valley, Arizona, USA, on 14 November 2019.
Continental Elementary School wanted to emphasize that “Thank You” letters are still important in our culture and are a vital way to communicate gratitude and civility, kindness and manners in our daily lives.