adding USPS standard parcel sizes, makes no sense

adding USPS standard parcel sizes, makes no sense

Hi,

when I create a shipment using USPS via Zoho, and I choose a small, medium or large flat rate box, the program asks me to enter the package size and weight, which makes no sense, since those USPS boxes are all a standard size, and, according to USPS, if it fits it ships. 
The sizes of these standard USPS boxes should be pre entered into the Zoho program.
It is really frustrating and a waste of time in having to enter the box size each time I create a shipment using standard USPS boxes.
As an example, if I create a shipment via PayPal, I do not need to enter box sizes for USPS standard boxes, so if PayPal can do it, I am sure Zoho can do it as well.