How do you make a 3 folded enclosure?

To make a three-folded enclosure, start with a rectangular piece of paper or cardstock. Measure and mark the paper into three equal sections, then use a ruler to create fold lines. Fold the paper in a way that the two outer sections overlap the middle section, creating the three folds. Finally, reinforce the creases for a clean finish, and you can decorate or use it as needed.