[ Ref. Brian Shaw in 240720 MMDigest ]

I ship a lot of piano rolls, often by the full box. Shipping by
US Postal Service Media Mail is strictly by weight. The USPS does not
use zones or package size as a criteria for shipping via Media Mail.
A rate chart is available here:
https://www.usps.com/business/prices/2024/m-media-mail-retail-and-comm.xlsx 

I created a small label that I use for all piano roll shipments;
a copy is attached. I've never had a problem with USPS using this
method.

Gary Goldsmith

[ https://www.mmdigest.com/Attachments/24/07/30/mime.240730_083016_gary.goldsmith4855@gmail.com.media%20mail%20label.docx