Publication 51 Revision: M-Bags Update

Effective February 2, 2009, the Postal Service™ is revis­ing Publication 51, International Postal Prices and Fees, to modify the Airmail M-bag section. This revision will align Publication 51 with Mailing Standards of the United States Postal Service, International Mail Manual (IMM®) revisions that will also be implemented on February 2, 2009.

In addition, we are revising the Publication 51 sections on International Priority Airmail™ (IPA®) and International Surface Air Lift® (ISAL®) to provide clarity to those parts that make reference to IPA and ISAL M-bags.

We will incorporate these revisions into the next printed version of Publication 51 and into the next online update of Publication 51, which is available via Postal Explorer® at