postal service rates first class

postal service rates first class are determined based on the weight and size of the item being mailed. USPS First-Class Mail is one of the most affordable options for sending small packages, letters, and postcards within the United States. Rates for First-Class Mail are typically based on weight and can vary depending on whether you are sending a letter, a parcel, or a postcard. First-Class Mail also offers delivery within 1 to 3 business days within the U.S., making it a quick and cost-effective choice for many types of mail. International rates for First-Class Mail may be higher and vary by destination.