I thought I would pass this on to you -
I brought a flat rate envelope to the PO this afternoon. It had a bubble wrapped box in it, which fit into the envelope. The flap did "just" close - I was told they would take it this time, but they were changing the flat rate rules. Apparently flat rate envelopes in the future - can only be 3/4" thick and what you put in it can not make the envelope "out of shape," and the flap on the envelope could not be taped shut.
I am not sure if this will affect anyone else, but in the past I've been able to ship Bingo games, baby clothes, fabric, vintage computer games and other rect/square items that could fit in the envelope, as long as the flap would close over it.
I am not a happy camper