Like said Tighline drop a heap of volume. So I would say 90 liters for you. I draw an original shape of the Mana 8'10" 30,5" 133 liters then I asked the CAD to reduce the 3 dims (length width and thickness) to match the volume of the board at 90
The result is a 7'9" 27,75" 3,8" 90 liters with the same shape... just to said