Mailer classification sizes

In the context of mailers, classification sizes refer to the standard sizes of envelopes and packages used for shipping and mailing purposes. Here are some common mailer classification sizes:

Letter Mailer Sizes:

1. Standard Letter (3.5 x 6.125 inches)
2. Large Letter (4.125 x 9.5 inches)
3. Extra Large Letter (4.5 x 10.5 inches)

Flat Mailer Sizes:

1. Small Flat (6.125 x 11.5 inches)
2. Medium Flat (9.5 x 12.5 inches)
3. Large Flat (12.5 x 15.5 inches)
4. Extra Large Flat (15.5 x 18.5 inches)

Package Mailer Sizes:

1. Small Package (6 x 6 x 6 inches)
2. Medium Package (8 x 8 x 8 inches)
3. Large Package (10 x 10 x 10 inches)
4. Extra Large Package (12 x 12 x 12 inches)

Specialty Mailer Sizes:

1. Catalog Mailer (6.5 x 9.5 inches)
2. Book Mailer (7.5 x 10.5 inches)
3. Tube Mailer (1-2 inches diameter x 36 inches long)
4. Roll Mailer (2-4 inches diameter x 36 inches long)

Please note that these sizes are general guidelines and may vary depending on the specific mailer or shipping carrier used. It's always a good idea to check with the mailer or shipping carrier for their specific size requirements and guidelines.