Flat Rate — Quick Reference

Available for Domestic and International

PRIORITY MAIL EXPRESS

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"


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"
12-1/2” x 9-1/2”

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 Priority Mail Express Flat Rate Envelopes, and Priority Mail Flat Rate Envelopes and Boxes are 70 pounds.

Weight restrictions for Priority Mail Express International Flat Rate Envelopes are 4 pounds. Weight restrictions for Priority Mail International Large and Medium Flat Rate Boxes are 20 pounds, and 4 pounds for Priority Mail International Flat Rate Envelopes and Small Flat Rate Priced Boxes.

You may order free packaging supplies at usps.com/store.