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IMM Issue 35 - International Mail Manual >
2 Conditions for Mailing > 230 Priority Mail International > 233 Priority Mail International Flat-Rate Boxes
All mailable items that may be sent as Priority Mail International, except those items allowed in the Priority Mail International flat-rate envelope, may be sent in Priority Mail flat-rate boxes (see 231). The contents must fit securely and must be entirely confined within the box. The box flaps must be able to close within the prefabricated folds.
A flat-rate box may be insured. See 320 and Individual Country Listings for insurance availability, limitations, and coverage. Registered Mail service is not available.
A Priority Mail International flat-rate box is charged at a flat rate. The price does not depend on the weight of the item. Postage is required for each piece. Exhibit 233.2 lists the prices for Priority Mail International flat-rate boxes.
Priority Mail International — Flat-Rate Boxes
Canada & Mexico
All other countries
Note: Indemnity for items mailed in flat-rate boxes are based on the weight and indemnity limits shown in Exhibit 234.4.
The weight limit for each flat-rate box is 20 pounds.
Each Priority Mail International flat-rate box must bear a properly completed PS Form 2976-A.