replacing the C50 rear seat
 

I have a 2009 C50. I was needing a bag to put some things on rides but I dont want to take a backpack. I was thinking of replacing the rear seat with a soft type case, like using the frame that the seat is on, but put a small bag on the frame instead of the seat. Has anyone done anything like that? Cn it be done? Anyone know where it could be done?