design me a backpack that has; 1) modular compartments which are located on top of the outer shell of the bag that made out of carbon fiber where 1/3 volume or 2/3 volume of other functional bags can be attached via magnetic clips on the carbon fiber shell 2) the backpack also has leather material used on shoulder straps 3) ergonomic design for back-waist contour feel, black and white with a tint of sepia,