Make a Custom Printed Double Sided No. 10 Business Envelope From a Sheet of Paper

Step 4 Fold Cut Templates

Next step is to fold the template. Since we want to hide the fold lines, fold inwards. I recommend folding the side flaps first.

Then, fold the bottom flap upwards.

The last fold is the top flap that you use to seal the envelope. There is no fold line (it would be visible), so imagine a line going across from the very top corners of the side flaps. Make sure to line this fold up well as it is apparent if it is crooked.