Parkinson’s law alludes to something along the lines of — the need to carry tools will always expand to fill the on-board space available. Assuming the renowned historian is correct, it could be argued that adding even more tool storage capacity is a pointless exercise, because the requirement will never be satisfied. Fair enough… but that won’t stop machine operators continuing to come up with innovative means of carrying more. Here’s a selection of supplementary toolbox designs from our habitually resourceful readers