Step 1. Cut the box along the edges of the front panel to remove the front panel.
Step 2. Cut off the 4 small flaps.
Step 3. Flip the box over and fold the 2 remaining flaps in toward the center. Put glue on the lower thirds of the flaps.
Step 4. Fold the panel closest to you up toward the center and glue it into place.
Step 5. Decorate your envelope.
We use these rigid envelopes to mail cards that people order from our shop. If they order something bigger, we make a bigger envelope out of a cracker or cereal box. This way, we get to reuse materials instead of increasing the demand for new cardboard by buying ready-made envelopes.