1st class mail vs priority

1st class mail vs priority compares two popular USPS services used by e-commerce businesses and individuals. First-Class Mail is more economical for lightweight items under 13 oz, with delivery in 2–5 days. Priority Mail is slightly faster, supports heavier packages, and includes tracking and insurance. Choosing the right service affects both cost and customer satisfaction. Many fulfillment services integrate USPS shipping options, enabling sellers to automate carrier selection based on weight, destination, and urgency, ensuring a balance between affordability and speed for different order types.