Those boxes are provided free from the post office. There's a few different ones, but not anywhere near the choice you'd get from a shipping supplies place. That one doesn't look like a flat rate box, but some of those can actually cost less in postage than a regular box depending on where it's going and the weight.
Persoanlly, having worked shipping a lot of stuff that was heavy for the size. Like 20+LBS in a box that was 10x10 x10. And knowing that with the PO, basically everything goes in a bin and you don't get to choose if the package on top of yours is a pillow or a lead brick I'd really prefer seeing stuff overpacked.
Steve B
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