This service is also known as Soft Pack Cubic Service
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Just like regular Priority Mail Cubic service, Softpack rates are based only on dimensions. Your package can weigh up to 20 lbs but the weight is not taken into account when calculating the cost of a shipment. This can save you up to 89% of the price you'd pay with the weight-based rate.
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The only difference for Softpack is the way the cubic pricing tier is calculated. In order to select the correct pricing tier for your envelope, follow these steps:
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1. Measure the length and width of the empty envelope or softpack mailer in inches;
2. If either of the measurements exceed the nearest quarter inch, round down to the nearest 1/4 inch (for example, 8.6 inches turns into 8.5 inches);
3. Add the length and width together for the total and use the chart below to determine which pricing tier your softpack envelope is in.

See the Priority Mail Cubic Softpack Commercial Plus Pricing Tiers below:

0.1: Envelopes with a Length plus Width measuring more than 0 inches up to 21 inches

0.2: Envelopes with a Length plus Width measuring more than 21 inches up to 27 inches

0.3: Envelopes with a Length plus Width measuring more than 27 inches up to 31 inches

0.4: Envelopes with a Length plus Width measuring more than 31 inches up to 34 inches

0.5: Envelopes with a Length plus Width measuring more than 34 inches up to 36 inches

Bound Printed Matter is a way to mail single-piece or volume presort permanently-bound sheets of advertising, promotional, directory or editorial material such as catalogs, books and other printed material using PS Form 8042 (Bound Printed Matter Documentation Form) and a permit account or a penalty permit account. BPM is no longer accepted at retail offices but must be deposited as business mail at the Business Mail Entry Unit where the permit imprint was issued.

Features

- Cost efficient way to send small and large packages containing permanently-bound sheets of directory, advertising, or editorial matter, such as catalogs or phone books.

- Permanently-bound sheets should be secured with staples, spiral binding, glue, or stitching.

- Packages can weigh up to 15 lbs. and measure up to 108 inches in combined length and distance around the thickest part.

- Discount rates available for 300 or more pieces.

- Only available for Permit mailings.

For more information on USPS Bound Printed Matter please visit this page on the USPS website.

Media Mail shipping is a way to send educational materials. This service has restrictions on the type of media that can be shipped.

Media Mail rates are limited to the items listed below:

Media Mail packages may not contain advertising.

Comic books do not meet this standard.

Books may contain incidental announcements of other books and sound recordings may contain incidental announcements of other sound recordings.

In accordance with standards in the Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM), Section 170, Media Mail packages must have a delivery address and the sender’s return address and are subject to inspection by the Postal Service™.

Upon such inspection, matter not eligible for the Media Mail rate may be assessed at the proper price and sent to the recipient postage due, or the sender may be contacted for additional postage.

For more information on Media Mail, please visit the USPS website.