I use a Condor H2O Pouch to protect my KX3 when it’s not in use. This pouch allows me to keep the KXSides on the KX3. It’s a bit on the heavy side, but it gives very good protection when not in use. I’ve put this case in my luggage when flying and haven’t had any issues.
Amazon Link to this case :
https://amzn.to/2ZW4bDq