Please Note: This product is only available in packages of ten (10). An order of 1 equals 10 envelopes.
The Priority Mail® Window Flat Rate Envelope features a window that allows pre-addressed envelopes, #10 regular in size or smaller, to be conveniently inserted. The address shows through clearly, making this item ideal for sending letters and other small documents via quick and easy to use Priority Mail Flat Rate™.
*Not recommended for passports or passport documentation.