First, take your cardstock and score it along the long side at 1" and 6-3/8".
Fold up the bottom 1" portion and secure it using a brad, being sure to keep it towards the bottom of the folded piece. Now on the longest section, punch holes at the 1-3/4" and 2-3/4" marks (these measurements taken from the scored line at the top), staying fairly close to the edge of the cardstock. These holes will keep your cardstock from tearing when you insert the cocoa packet.
Next, take your straight edge and use your craft knife to make two slits in between the holes you punched.