is regular mail first class

is regular mail first class refers to USPS First-Class Mail, a service for sending lightweight, non-priority packages, letters, and postcards. First-Class Mail is one of the most affordable mailing options available through the United States Postal Service, offering reliable delivery at a reasonable price. It is commonly used for personal letters, greeting cards, and small packages that weigh up to 13 ounces. First-Class Mail is typically delivered within 1 to 3 business days, depending on the destination. Although it is not considered an expedited service, it is one of the most efficient and cost-effective methods for everyday mailings.