I have an iPortable iP60z Field SWR Analyzer that it small and portable however too portable and I just throw it in my bag and I always somehow flip the switch on and it drains the 9V battery...welp I said enough of that... I made a cover and it just slips on with a piece of Velcro or a rubber band and only goes on if the power is off... could I add clips? maybe...but  I wanted something simple. 

Feel free to hit me up if you want more info or want the tinkercad info.