I have been using the PGYTECH Mavic 2 Propellers Holders,and I have a hard case. They are on DJIs site or on Amazon
Amazon.com: Mavic 2 Propeller Holder, Paddle Protect, Propellers Blade Fixed Clip, Protector Bracket/Propeller Fixator/Clip for DJI Mavic 2 Pro,Zoom, DJI Mavic 2 Accessories, with...