I'm using the same: ThinkTank Helipak. Love it. Lots of space, and so much lighter than the GoProfessional hardshell cases I have used for previous quad's. Very well built.I'm using the ThinkTank Airport Helipak. Cannot say enough good things about it. A bit on the pricey side but I've been a user of there other packs/ cases over the years and they are built to last.
The Microraptor pro case. It's great!