what is usps first class

what is usps first class USPS First Class Mail is a cost-effective and efficient service primarily used for sending small packages, letters, and postcards. It’s the fastest option for lightweight items weighing up to 13 ounces, offering delivery times of 1 to 3 business days within the United States. While First Class Mail is not guaranteed for expedited delivery, it’s an excellent choice for sending everyday items that don’t require express shipping. This service includes tracking for most shipments and is one of the most affordable options for domestic mail.