Closed
Description
When a product (and/or total weight) is very low, then USPS kicks back an error that no package weight has been specified.
If an order has a total weight of less than 1 ounce, then the USPS module rounds it to the nearest whole number (which is often 0) and sends that off to USPS for a shipping quote. The FedEx module, in contrast, does not round at all.
I checked in with the USPS pricing api docs and it says that there can be 10 total digits for the ounces field.