Question about using USPS Priority boxes

[jeffrey000]

I ordered 2 Priority boxes

https://store.usps.com/store/product/shipping-supplies/priority-mail-box-7-P_O_BOX7

https://store.usps.com/store/product/shipping-supplies/priority-mail-box-4-P_O_BOX4

*Can I re-shape these 2 fit the item I need and just pay the rate for the new dimensions and the weight of it?

**these are not flat rate boxes

[nobody*s_perfect]

Yes, those are very popular sizes for fitting together to make "frankenboxes."

You do have to be careful when combining the 07's because  they measure 12x12x8 inches, and any box over 1 cubic foot (i.e., 1728 cubic inches)  is subject to a "dimensional weight." For instance, a box that's 12 by 12 by 13 inches will ship at the 12-pound rate (unless of course it weighs more than that).

For Priority Mail packages up to 1 cubic foot, the package dimensions have no effect on the postage rate.  None of the USPS free Priority Mail boxes are over 1 cubic foot, so none of them are subject to dimensional rates, until you start combining them.

There used to be a box that measured 12 by 12 by 15, but it hasn't been offered in years.

[donsdetour]

If boxes are marked large medium or small flat rate do not modify them.

One of your links is a flat rate.

You really should ask the USPS about this.

[simba6]

It's only the special or flat rate boxes you can't rework.

[nobody*s_perfect]

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@donsdetour wrote:

If boxes are marked large medium or small flat rate do not modify them.

One of your links is a flat rate.

You really should ask the USPS about this.

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The two links go to regular-rate boxes, not flat rate boxes.

[toysaver]

Make sure you measure the package you design, the numbers on the box are not always right.

[donsdetour]

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@nobody*s_perfect wrote:

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@donsdetour wrote:

If boxes are marked large medium or small flat rate do not modify them.

One of your links is a flat rate.

You really should ask the USPS about this.

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The two links go to regular-rate boxes, not flat rate boxes.

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I did not read but photo in first link shows Large box. misread the label on it. .