Suspension or floating straps were tried out with this bag. It ended that in this case, due to the bag not being particularly huge - it made no difference and in some cases was actually less comfortable.
The real difference came when the adjustable height sternum (chest) strap was added. It's hugely important for keeping the straps in place, due to the shape of our necks and shoulders as human beings - the straps slide outwards without them.. which to me personally makes a bag unwearable.
That's brill, thanks for the info.