The definition of simple!
Simply dip a Humi-Care Portable Humidification pillow in distilled water. The pillow it expands as water is absorbed, then slide pillow into its plastic sleeve and place in your humidor or travel box. Boom! Instant humidification. Reusable 2-3 more times. Then toss and grab a new one.
This is a set of 10 Humi-Care Portable Humidification Pillows.