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...
I just got an Air3S just to have that Class A1 label indicating that it's under 900 grams. But I probably could have gotten a Mavic 3 or 4 Pro instead and use it in A1 Open Category like a C0 or C1 drone and probably never get confronted to...
I traveled internationally more than once with my M3P. It's compact and was no hassle whatsoever. I followed rules and had a very enjoyable experience. Sure, the smaller models are more convenient, but as a pro photographer, I needed the best...
They are selling with tacit approval from DJI so call it what you want. B&H is my favorite but Adorama is doing a bang up job IMO by coming thru for Americans during trying times. Won't be forgotten. :)