Flat Rate Priority Envelopes… Is it Flat Rate Pricing or does it mean it has to be Flat?
Flat Rate Priority Envelopes means it is the same price to mail a package anywhere in the United States, Puerto Rico and Territories including FPO/APO for around $5.00
It can be any thickness as long as the envelope has not be reshaped by cutting it … actually read the DMM here
This is 123 1.5 of the DMM for USPS.
If it fits, it ships. Â UP TO 70 lbs.
You can print off the DMM from the USPS website. Â Copy 123 1.5 and take to the post office if you have postal clerks that don’t know the postal regulations.