Vendors you don't have to ship product face to face with a usps clerk, you can just randomly walk into any post office and purchase a priority stamp for 4.95$ i do it at least once a week. The flat rate envelopes are free and usually just sitting out in the waiting area for you to just grab. I suggest everyone mailing under 32 ounces grab some flat rate envelopes & Priority stamps, gran some bubble mailers if you have product that might get damaged easy for extra internal flat rate letter envelopes and prepare your packages at home in privacy wearing latex gloves and dropping the envelops in random blueboxes across your local town or the next closest town. Super easy & simple guys, idk how it gets screwed up so easy. Flat rate sizes come from your average letter size up to big boxes depends on size you need for shipping product......DO NOT USE THESE FLAT RATE PACKAGES WITHOUT PURCHASING PRIORITY STAMPS< THAT IS THE ONLY REASON THOSE ENVELOPS & BOXES ARE FREE TO USE.