Question

what are consider as first class mail

Answer 1

By this you can send standard postcards, letters and large envelopes and small packages up to 15.99 ounces using First Class Mail. If your First Class package is over 15.99 ounces, you must upgrade the mail class for Priority Mail.

Answer 2

hola!!

your answer is----

First Class Mail is the most popular and economical way to send items through USPS. You can send standard postcards, letters and large envelopes and small packages up to 15.99 ounces using First Class Mail. If yourFirst Class package is over 15.99 ounces, you must upgrade the mail class to Priority Mail.