You might have business with envelopes every day and know about how it feels when you receive one from a friend. Anyways now days even the looks of the envelope might be important for companies or normal people. So, if you want to show your design on an envelope, you can try this mockup.
This is an envelope mockup with letterhead in a top view showcase. You can change the color of the background and add your design to the envelope easily. Enjoy it.