Flat mailing sizes vs

You're referring to the different sizes of envelopes used for mailing!

In the United States, the most common flat mailing sizes are:

  1. Letter: 3.5 x 6.125 inches (8.9 x 15.6 cm) - used for standard letters and documents.
  2. Large Letter: 4.125 x 9.5 inches (10.5 x 24.1 cm) - used for larger documents, such as catalogs and brochures.
  3. Flat: 11.5 x 13 inches (29.2 x 33 cm) - used for larger, flat items like posters, maps, and artwork.
  4. Flat Rate Envelope: 12 x 15 inches (30.5 x 38.1 cm) - used for Priority Mail and other flat-rate shipping services.

In Canada, the most common flat mailing sizes are:

  1. Letter: 3.5 x 6.125 inches (8.9 x 15.6 cm) - used for standard letters and documents.
  2. Large Letter: 4.125 x 9.5 inches (10.5 x 24.1 cm) - used for larger documents, such as catalogs and brochures.
  3. Flat: 11.5 x 13 inches (29.2 x 33 cm) - used for larger, flat items like posters, maps, and artwork.
  4. Flat Rate Envelope: 12 x 15 inches (30.5 x 38.1 cm) - used for Priority Mail and other flat-rate shipping services.

In the United Kingdom, the most common flat mailing sizes are:

  1. Large Letter: 114 x 165 mm (4.5 x 6.5 inches) - used for standard letters and documents.
  2. Large Parcel: 229 x 330 mm (9 x 13 inches) - used for larger items, such as books and magazines.
  3. Flat: 305 x 457 mm (12 x 18 inches) - used for larger, flat items like posters, maps, and artwork.

Please note that these sizes are general guidelines and may vary depending on the specific postal service and shipping requirements. It's always a good idea to check with your local post office or shipping carrier for specific size and weight restrictions.