How does the blue USPS box work? A while ago, I shipped a small package and it cost like $6, but it was less than 13 oz. So could I have just

Current USPS Postage Rate Charts - simple tables

How to cancel a free USPS box order - Quora

Can I ship a small bubble mailer (5”x4”) with just a stamp (it

Does the USPS still accept box packages wrapped in brown paper

Can I use USPS boxes for Mercari? - Quora

Apparently buyers don't understand that shipping has to be paid

Can USPS ship any box as long as it is labeled (ie shoe box

Is it okay to just put stamps on a large envelope (9x12', 12'x12

Did the seller really ship my item? : r/Mercari

Do shipping carriers like USPS take more care handling packages

If a letter weighs 1.1 ounces, can I put a USPS first class