Minimum envelope size for us mail
According to the United States Postal Service (USPS), the minimum envelope size for First-Class Mail is:
- Length: 3.5 inches (8.9 cm)
- Height: 6.125 inches (15.6 cm)
- Thickness: 0.007 inch (0.18 mm)
This is the minimum size required for a standard letter-sized envelope. However, it's worth noting that the USPS also has specific requirements for the size and shape of envelopes for other types of mail, such as:
- Large Envelopes (also known as "flat" mail): 11.5 inches (29.2 cm) in length and 6.125 inches (15.6 cm) in height
- International Mail: 6.125 inches (15.6 cm) in length and 11.5 inches (29.2 cm) in height
- Priority Mail: 12 inches (30.5 cm) in length and 15 inches (38.1 cm) in height
It's also important to note that the USPS has specific requirements for the weight and size of envelopes for certain types of mail, such as packages and flats. If you're unsure about the size or weight requirements for your mail, it's always best to check with the USPS or consult their website for more information.