Size: 3000pxX2000px
Double click on Smart object.
Place your design in the .PSB file.
Save the .PSB File and close. You’re Done!
Note: This will work well only with transparent background. The edges/corners will not be clean if any other background colors are used.
Recycled Card Board Box for Mockup on Corrugated Sheet
Recycle Blank Card Board Box for Mockup on Corrugated Background