Are you sending a care package or mailing a letter to a faraway destination? There's a good chance the label or envelope could get wet and cause whatever you wrote on the label to fade or wash out. Instead of using plastic tape to create a barrier to waterproof the address, reach for a white candle. When you rub the candle over the label or envelope, you create a waterproof shipping label or envelope. Plus, because you didn't use tape or a plastic pouch cover, the whole thing is still recyclable.