I Tested the Versatility of 4 3/8 x 5 3/4 Envelopes: Here’s Why They’re a Must-Have for Every Mailer!
I don’t know about you, but I have always found envelopes to be a fascinating invention. They come in all shapes and sizes, each with their own unique purpose. And today, I want to talk about a particular type of envelope that has been gaining popularity in the world of mailing – the 4 3…