Originally Posted by gale
Actually I disagree. The PO gives those boxes away at no charge because the cost of priority mail pays for them. I bet postage would be incredibly high if they were to give out boxes for parcel post or media mail or whatever. Even though postage seems high sometimes, I think it's actually pretty cheap compared with some other countries.
I have to agree with you. Their boxes, their rules. Can't follow their rules, don't use their boxes. Simple as that. You can send things priority in any box, just not flat rate.