Humistat #1 Humidifier 

This is another nifty humidifier which would work well in a variety of settings: travel cases, small humidors or a supplement to boost humidity. You fill it with water by removing the bottom cap. The top cap can be turned to expose more or less vent holes to allow water vapor to pass out. Now the stats:

Color: Clear with tan bottom/top caps.
Size: Ht. 2&1/2 in & Diameter 3/4 in.
Other Features: Adjustable vent cap.