Sustainability has become a very important research area in transportation where demands and associated environmental impacts have been increasing. An introductory exploration is established here, where transport efficiency is studied in two partial measures, mass efficiency and volume efficiency. An optimisation problem is then formulated here to find an acceptable design config- uration that merely satisfies the transport constraints and maximising transport efficiency. It is observed that there are trade-offs between environmental impacts in terms of energy requirement and the optimised design configuration.