The video below was submitted to PEN to post. In question is – if the customer can get their item/product into the flat rate envelope without cutting the envelope or changing the envelope in any way does the package ship at the named flat rate for that envelope or will there be postage due?
I contend that USPS says it all…”If it fits – It ships.” What is your opinion…please include a link, or links, to USPS regulation(s) backing up your response. [please – do not copy and paste large segments of text…just post a link].

Laura nailed it. Couldn’t be more on bored ourselves.
Just watched the video, she is 100% correct, unfortunately there are too many folks who don’t know the rules who are in a position of power. Its up to the rest of us to hold them accountable. Great job!
The DMM under 1.7 used to say that the envelope must close on normal folds and the shape of the container could not be reconstructed or altered. Now it is 1.8 and there is no mention of this – just says up to 70Lbs. So I am thinking “depleted Uranium”? Anyway, you get the point. One customer of ours was stuffing so much clothing into these envelopes they looked like it contained a ball. USPS took them for a long time finally convinced client that the cubic program was less expensive
https://www.usps.com/ship/priority-mail-flat.htm
•When sealing a Flat Rate Envelope or Flat Rate Box, the container flaps must be able to close within the normal folds.
So, what is considered to be the “normal” fold? The envelope starts out flat. Putting anything into it would mean that it could not close within the original fold. Does the USPS define “normal” somewhere? On the video, it looked like the flap was affixing in the expected region.
Originally I thought if it was over 3/4″ thick it didn’t qualify for flat-rate pricing. But I had mis-read the last paragraph in this link from the DMM. http://pe.usps.com/text/dmm300/101.htm#1002686
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