what’s the difference between first class mail and priority mail is a common question among customers who need to send packages through the USPS. First Class Mail is typically used for smaller, lighter items such as letters, postcards, and small parcels, and is the most affordable option. Priority Mail, on the other hand, is faster and allows for heavier packages, with delivery in 1-3 business days. The key difference lies in the speed and weight limits, with Priority Mail offering additional features like tracking, insurance, and delivery guarantees. Understanding these differences helps customers choose the right service based on urgency and budget.