Postal Letter

Can I send a Priority Mail International Flat Rate package with the dimension 18" x 12" x12 "?

I want to send a package weighed less than 20lbs to Vietnam. The Priority Mail International Flat Rate is cheapest service. But I have some oversize items, so I have to pack them in 18" x 12" x12" carrier. Is it possible or I must use the supply from USPS?

Public Comments

1. If you can not fit it in the flat rate box then you will have to pay by weight. USPS has free boxes for you but you're free to use your own box and put Priority Mail sticker on it.
2. Don't know where you have got an 18 incher flat rate pkg. As the Flat rate box I got fm the P.O. is lenght 13 &3/4 " width 11 & 3/4 " with depth of 3 & 1/4". That is domestic and international use. So where you got yours must have been luck to get that size.