You can put a 1000# sac in the rear locker. I did this on a 2012. I think you can put the 650#
Size: 60"L x 26"W x 10"H. In the coffin/cooler area. The only thing is I am not 100% sure of the dimensions of these areas. I will need to wait and see. If anyone has an X30 and wants to measure this area (starboard side cooler locker) that would be great?