But it can often do so more efficiently than just carrying one container at a time when they're empty - see this company that's solving the "return container" p

But it can often do so more efficiently than just carrying one container at a time when they're empty - see this company that's solving the "return container" problem by folding up to 4 containers into the space of one for the return trip. https://4foldcontainers.com/proposition/ https://4foldcontainers.com/proposition/