Sizes of priority mail envelopes

The United States Postal Service (USPS) offers a variety of Priority Mail envelope sizes to fit different types of mailings. Here are the standard sizes for Priority Mail envelopes:

Small Flats

• 6 1/8" x 3 5/8" x 1/2" (15.5 cm x 9.2 cm x 1.3 cm)
• Weight limit: 3 oz (85g)

Medium Flats

• 9 1/2" x 6 1/8" x 1/2" (24.1 cm x 15.5 cm x 1.3 cm)
• Weight limit: 13 oz (368g)

Large Flats

• 12" x 9 1/2" x 1/2" (30.5 cm x 24.1 cm x 1.3 cm)
• Weight limit: 20 oz (567g)

Extra Large Flats

• 15" x 12" x 1/2" (38.1 cm x 30.5 cm x 1.3 cm)
• Weight limit: 26 oz (737g)

Greeting Card Flats

• 5 1/2" x 4 1/4" x 1/4" (14 cm x 10.8 cm x 0.6 cm)
• Weight limit: 1 oz (28g)

Square Envelopes

• 6" x 6" x 1/2" (15.2 cm x 15.2 cm x 1.3 cm)
• Weight limit: 3 oz (85g)

Long Envelopes

• 12" x 15" x 1/2" (30.5 cm x 38.1 cm x 1.3 cm)
• Weight limit: 20 oz (567g)

Please note that these sizes are subject to change, and the USPS may offer additional sizes or variations. It's always a good idea to check with your local post office or the USPS website for the most up-to-date information on Priority Mail envelope sizes and weight limits.