Maintain a perfect 70% relative humidity in your travel case or humidor with XIKAR's new Cigar Bar humidifiers. These travel sized humidifiers are full of crystals that shrink slowly as water evaporates over time. Fill with XIKAR activation solution or distilled water to start using and you may also refill once a month or as needed (unit must be filled before first use). Use one XIKAR Cigar Bar humidifier for every 50 cigars. It will only take the space of one cigar in your travel case or humidor!*Please note that this product has changed and it now comes in dry form. To use, you must activate the crystals with PG solution (recommended) or distilled water.