Would you like to hide important documents or emergency money in your house that nobody can find? Then this is the life hack for you. According to the book, a large envelope can be tacked to the back of a drawer to conceal your papers.
You simply need to remove an unsuspecting drawer of your choice from its rails and fill the envelope with your important material. Then, take a thumbtack or a staple gun and attach it to the back of the drawer. When the envelope is secure in place, just put the drawer back on the rails and slide it into position.