This ProTek 30 Cigar Capacity Travel Humidor has been engineered to withstand the toughest conditions while keeping your cigars fresh. It comes with a ProTek humidification unit containing propylene glycol humidity beads. The travel humidor has an airtight seal and is both waterproof and crushproof. A purge valve is provided so that the humidor can be easily opened after an altitude change such as air travel. Foam pads are included to cover and protect your cigars even more. The humidor also features compound latches, stainless steel hinge pins and key padlock holes. To use, simply fill the humidifier with distilled water and shake to remove excess water, then place inside the unit.