what is flat shipping rate

what is flat shipping rate refers to a predetermined shipping charge that does not vary based on the weight, size, or distance of the package being shipped. Instead, customers pay a fixed amount for shipping, regardless of the number of items or the destination. Flat rate shipping is commonly used by postal services and online retailers, as it simplifies the shipping process and helps customers predict shipping costs. USPS offers flat-rate shipping for certain boxes and envelopes, making it a popular choice for e-commerce businesses.