Available for Domestic and International

EXPRESS MAIL
Flat Rate Envelope
12-1/2" x 9-1/2"

Legal Flat Rate Envelope
15" x 9-1/2"

Flat Rate Boxes
Top Loading (Domestic Use Only)
11" x 8-1/2" x 5-1/2" – Inside
11-1/4" x 8-3/4" x 6" – Outside

Side-Loading
13-5/8" x 11-7/8" x 3-3/8" – Inside
14" x 12" x 3-1/2" – Outside

PRIORITY MAIL
Flat Rate Envelope
12-1/2" x 9-1/2"

Legal Flat Rate Envelope
15" x 9-1/2"

Padded Flat Rate Envelope
12-1/2" x 9-1/2"

Gift Card Flat Rate Envelope
10" x 7"

Small Flat Rate Envelope
10" x 6"

Window Flat Rate Envelope
10" x 5"

Small Flat Rate Box
8-5/8" x 5-3/8" x 1-5/8" – Inside
8-11/16" x 5-7/16" x 1-3/4" – Outside

Medium Flat Rate Boxes
Top Loading
11" x 8-1/2" x 5-1/2" – Inside
11-1/4" x 8-3/4" x 6" – Outside

Side Loading
13-5/8" x 11-7/8" x 3-3/8" – Inside
14" x 12" x 3-1/2" – Outside

Large Flat Rate Box
12" x 12" x 5-1/2" – Inside
12-1/4" x 12-1/4" x 6" – Outside

APO/FPO/DPO
Large Flat Rate Box
12" x 12" x 5-1/2" – Inside
12-1/4" x 12-1/4" x 6" – Outside

Board Game Large Flat Rate Box
23-11/16" x 11-3/4" x 3" – Inside
24-1/16" x 11-7/8" x 3-1/8" – Outside

Large Video Box (Flat Rate pricing for international only)
9-1/4" x 6-1/4" x 2" – Inside
9-9/16" x 6-7/16" x 2-3/16" – Outside

DVD Box (Flat Rate pricing for international only)
7-9/16" x 5-7/16" x 5/8" – Inside
8-3/4" x 5-9/16" x 7/8" – Outside

Note: Flat Rate prices are available when material is sent in a USPS-produced Flat Rate Envelope or Box. When sealing a Flat Rate Box or Flat Rate Envelope, the container flaps must be able to close within the normal folds. Tape may be applied to the flaps and seams to reinforce the container; provided the design of the container is not enlarged by opening the sides and the container is not reconstructed in any way.

Weight restrictions for domestic Express Mail and Priority Mail Flat Rate Envelopes and Boxes are 70 pounds.

Weight restrictions for Priority Mail International are 4 pounds for the Flat Rate Envelopes, Small Flat Rate Box, and DVD Box and Large Video Box; 20 pounds for the Medium Flat Rate Boxes and the Large Flat Rate Box.

Weight restrictions for Express Mail Flat Rate International vary by country and are noted in the Individual Country Listings. However, the maximum weight limit for any Express Mail International shipment is 70 pounds.

You may order free packaging supplies at usps.com/shop and find out more information about Priority Mail at prioritymail.com