Flat Rate prices are available when material is sent in a USPS-produced Flat Rate Envelope or Box. Weight restrictions for domestic are 70 lbs. Weight restrictions for Priority Mail International are 4 lbs for the Flat Rate Envelopes, Small Flat Rate Box, DVD, and Large Video Box; 20 lbs for the Medium and Large Flat Rate Boxes. Express Mail International Flat Rate Boxes have a maximum weight limit of 20 lbs; the Flat Rate Envelopes have a maximum weight of 4 lbs.
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