If you're not in a controlled environment, keep 'em in the case. The difference in humidity can be as much as 15%. In addition to the strategically located humi-paks in the case, I throw a towel over her as added protection. When it feels a "humidified", I hang it on the nearest door knob 'til it feels dry to the touch. Inside the case was ~45%. Humidity around here can get to ~90%+ & still be cool enough to leave the a/c off.