8.5 x 11 mailing envelope

A classic size!

An 8.5 x 11 mailing envelope is a standard size for letters and documents in the United States. It's a popular choice for sending mail because it's easy to find and fits comfortably in most mailboxes.

Here are some key dimensions to keep in mind:

• Length: 8.5 inches (21.59 cm)
• Width: 11 inches (27.94 cm)
• Height: 0.5 inches (1.27 cm) to 1 inch (2.54 cm) (depending on the thickness of the contents)

This size envelope is suitable for sending:

• Letters and documents
• Small packages and parcels
• Catalogs and brochures
• Marketing materials and promotional items

Keep in mind that the USPS (United States Postal Service) has specific guidelines for envelope sizes and shapes, so make sure to check their website for more information if you're planning to send mail regularly.