SOLVED - See post below if you were wondering how to make it fit... I bought the "official" DJI hardshell backpack to transport either my P3S or P3A. The P3A controller fits in just fine. snug but fits. The P3S controller does not. The "Smart Device" arm cannot be moved in such a way to get it to fit in the case. The only way I see to get it to fit is to remove the arm. Sure not a big deal unless you are trying to re-assemble in the field over grass, dirt, sand, or any surface that dropping screw and trying to find it becomes problematic. Anyone have a reasonable solution/workaround for this?