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. Just refill with XIKAR activation solution 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!