USPS Priority Flat rate is a shipping service provided by the US Postal Service that offers 1-3 day shipping services for a single flat rate. However UPS ground can be less expensive when packages exceed 2lbs in weight. Which is cheaper UPS or USPS? For packages weighing less than 16oz, USPS is almost always the cheapest way to ship. For Priority Mail Package and Thick Envelope, you usually have to provide your own packaging.0 Yes! An added bonus of USPS Flat Rate and Regional Rate boxes is that USPS offers free packaging for these services. USPS Tracking and a small amount of insurance is typically included with your shipment.2 Can I use my own box for flat rate shipping? Priority Mail can be used to ship much larger packages (up to 70 lbs for some services). Priority Mail is typically faster than First-Class, shipping in an estimated 1-3 business days, rather than 1-5 days. What is the difference between first class Mail and priority mail?

If you use your own envelope or box for Priority Mail, identify it with the marking, 'Priority Mail.' Priority Mail packaging provided by the USPS must be used only for Priority Mail. First-Class Mail items weighing more than 13 ounces is called Priority Mail. Can I use my own envelope for priority mail?

How much is priority mail flat rate?