With Flat Rate Envelopes, bulges and thickness may not matter.

This includes 9x12, legal, and manila envelopes, Two stamps are needed for the first ounce, and postage will be an additional $0.20 cents after.Ĭan you put anything in a flat rate envelope? How much does it cost to mail a 9x12 envelope? Postage must be purchased at any Post Office or online at. 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.Īlso, Priority Mail® Flat Rate envelopes - WITHOUT postage affixed - are available free at any Post Office™. First-Class Mail items weighing more than 13 ounces is called Priority Mail. If you were shipping a regular Priority Mail shipment in your own packaging, the USPS would charge you based on your item's weight and the destination zone or country.ĭomestic Priority Mail Flat-Rate Packaging Information Can I use my own envelope for priority mail? When your packages are lighter, Priority Mail sometimes even beats Flat Rate on price, particularly on packages that are only a couple pounds and traveling to Zone 4 or closer.0 What is the difference between Flat Rate and priority mail?įlat Rate and Priority Mail Differences A key difference between flat rate and Priority Mail lies in what you pay.

Priority Mail from USPS is often the cheapest way to get a package to its destination in 1-3 days, tracking included. 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.

Usps flat rate mailing envelope