I have poured over all the threads on here about cases vs backpacks. Since I will be flying with my new P4 next month I am struggling with getting a backpack or hard case. I think I would prefer to carry on my drone so am leaning toward a backpack since it looks like hard cases are touch and go with being small enough to pass as carry on. But it seems like a backpack could end up also being too big. I hate the thought of trying to carry it on in a backpack and having to end up checking it....much better in a hard case in that situation. So what do you guys prefer?