Coming from a Air 3S and a Autel EVo 2 Pro I am still impressed with the advanced feature set and RC Pro 2. Things have come long ways from the days I built my own from scratch and hung a GoPro beneath it hoping to film something worth watching.
The Lowepro Droneguard BP 250 is great for carrying the M4P. I used this with a Autel Evo 2 for 5 years; it is still in great shape and will now serve well for the M4P.
It has room for the drone, 3 batteries, ND case and RC 2 Pro with lanyard...