Actually I asked a engineer and he thinks it should be stored Horizontal because even if you have a good Gimbal clamp the 4 white rubber things that hold the Gimbal unit would be best server if stored Horizontal.... He a retired NASA engineer, he didn't thing any short period would be an issue but he suggested leaving it horizontal when possible. I have a hard case as well so that what I do. -- HE was quite impressed with the unit .... he was going "man if I had something like this back when we did the Apollo missions" ...... He goes we still used Slide rulers to calculate things!