For hard cases, I really like the Go Professional and Microraptor Pro cases (in that order). You can find a complete list of commonly used P3 cases and backpacks here.
I'm poor & wanted a hard case. I ended up buying this case @MCM Electronics for about $80 shipped. Saved so much $$$ I also bought a small case for my GoPro for an extra $13. I own a couple of Pelican cases....these are no Pelicans, but I am more than pleased with them! The cases are "pluck" foam & was easy figuring out the pattern I needed. Also I was lazy & didn't want to takes off the props. No issues thus far
I use a backpack by Drone Crates... Very good and though thick light and extremely light and padded very well. Space is enormous to carry anything you need. I've enclosed a link.