Lanza laptop travel bag / hand-held luggage bag
This 3-compartment luggage bag is no longer needed, and is being effectively given away. It has minor wear and tear, but amusingly mostly from the cat than from airline travel. It includes the detachable shoulder strap. It's 55×25×30 (w×d×h), but squashes down to next to nothing (base folds up). If the advert is still up, then this is still available.